1 warning found. Every finding below comes from what was actually in the pasted files. Treat the fixes as suggestions: they cover the common causes, and this case may need more digging.
online-mode=false: the server accepts any username without checking it against Mojang. Anyone can join as anyone, including your admins, and player identities are name-derived UUIDs that change if online mode is ever switched back on. Set online-mode=true in server.properties unless a proxy in front handles authentication, in which case configure proper forwarding (Velocity modern forwarding or BungeeCord IP forwarding) so real identities reach the server.
[19:42:52] [Server thread/INFO] [minecraft/DedicatedServer]: Starting Minecraft server on *:25565
[19:42:52] [Server thread/INFO] [minecraft/NetworkSystem]: Using epoll channel type
[19:42:52] [Server thread/WARN] [minecraft/DedicatedServer]: **** SERVER IS RUNNING IN OFFLINE/INSECURE MODE!
[19:42:52] [Server thread/WARN] [minecraft/DedicatedServer]: The server will make no attempt to authenticate usernames. Beware.
[19:42:52] [Server thread/WARN] [minecraft/DedicatedServer]: While this makes the game possible to play without internet access, it also opens up the ability for hackers to connect with any username they choose.
[19:42:52] [Server thread/WARN] [minecraft/DedicatedServer]: To change this, set "online-mode" to "true" in the server.properties file.
[19:42:53] [Server thread/WARN] [FML]: Potentially Dangerous alternative prefix `minecraft` for name `bread`, expected `harvestcraft`. This could be a intended override, but in most cases indicates a broken mod.
[19:42:53] [Server thread/WARN] [FML]: Unable to find recipe for minecraft:rabbit_stew
[19:42:53] [Server thread/WARN] [FML]: Potentially Dangerous alternative prefix `minecraft` for name `beetroot_soup`, expected `harvestcraft`. This could be a intended override, but in most cases indicates a broken mod.
[19:42:53] [Server thread/WARN] [FML]: Potentially Dangerous alternative prefix `minecraft` for name `mushroom_stew`, expected `harvestcraft`. This could be a intended override, but in most cases indicates a broken mod.
[19:42:53] [Server thread/WARN] [FML]: Potentially Dangerous alternative prefix `minecraft` for name `cookie`, expected `harvestcraft`. This could be a intended override, but in most cases indicates a broken mod.
[19:42:53] [Server thread/WARN] [FML]: Potentially Dangerous alternative prefix `minecraft` for name `pumpkin_pie`, expected `harvestcraft`. This could be a intended override, but in most cases indicates a broken mod.
[19:42:53] [Server thread/WARN] [FML]: Unable to find recipe for minecraft:baked_potato
[19:42:53] [Server thread/INFO] [harvestcraft]: Registering drops for shadedGarden.
[19:42:53] [Server thread/INFO] [harvestcraft]: Registering drops for tropicalGarden.
[19:42:53] [Server thread/INFO] [harvestcraft]: Registering drops for windyGarden.
[19:42:53] [Server thread/INFO] [harvestcraft]: Registering drops for frostGarden.
[19:42:53] [Server thread/INFO] [harvestcraft]: Registering drops for aridGarden.
[19:42:53] [Server thread/INFO] [harvestcraft]: Registering drops for soggyGarden.
[19:42:53] [Server thread/WARN] [FML]: Potentially Dangerous alternative prefix `minecraft` for name `pamapiary`, expected `harvestcraft`. This could be a intended override, but in most cases indicates a broken mod.
[19:42:53] [Server thread/WARN] [FML]: Potentially Dangerous alternative prefix `minecraft` for name `pammarket`, expected `harvestcraft`. This could be a intended override, but in most cases indicates a broken mod.
[19:42:53] [Server thread/WARN] [FML]: Potentially Dangerous alternative prefix `minecraft` for name `pamshippingbin`, expected `harvestcraft`. This could be a intended override, but in most cases indicates a broken mod.
[19:42:53] [Server thread/WARN] [FML]: Potentially Dangerous alternative prefix `minecraft` for name `pampresser`, expected `harvestcraft`. This could be a intended override, but in most cases indicates a broken mod.
[19:42:53] [Server thread/WARN] [FML]: Potentially Dangerous alternative prefix `minecraft` for name `pamgroundtrap`, expected `harvestcraft`. This could be a intended override, but in most cases indicates a broken mod.
[19:42:53] [Server thread/WARN] [FML]: Potentially Dangerous alternative prefix `minecraft` for name `pamwatertrap`, expected `harvestcraft`. This could be a intended override, but in most cases indicates a broken mod.
[19:42:53] [Server thread/WARN] [FML]: Potentially Dangerous alternative prefix `minecraft` for name `pamwaterfilter`, expected `harvestcraft`. This could be a intended override, but in most cases indicates a broken mod.
[19:42:53] [Server thread/WARN] [FML]: Potentially Dangerous alternative prefix `minecraft` for name `pamgrinder`, expected `harvestcraft`. This could be a intended override, but in most cases indicates a broken mod.
[19:45:59] [Netty Epoll Server IO #3/INFO] [FML]: Client protocol version 2
[19:45:59] [Netty Epoll Server IO #3/INFO] [FML]: Client attempting to join with 14 mods : minecraft@1.12.2,grapplemod@1.12.2-v13,FML@8.0.99.99,obfuscate@0.4.2,mcef@0.9,harvestcraft@1.12.2zb,cgm@0.15.3,appleskin@1.0.14,jei@4.16.1.1001,forge@14.23.5.2860,neat@1.4-17,mcp@9.42,webdisplays@1.0,oreexcavation@1.4.150
[19:46:01] [Server thread/INFO] [FML]: [Server thread] Server side modded connection established
[19:46:01] [Server thread/INFO] [minecraft/PlayerList]: SL_1056[/127.0.0.1:45212] logged in with entity id 196 at (-274.38043875320227, 69.0, -221.4133662343206)
[19:46:01] [Server thread/INFO] [minecraft/DedicatedServer]: SL_1056 joined the game
[19:46:13] [Server thread/INFO] [minecraft/NetHandlerPlayServer]: SL_1056 lost connection: Disconnected
[19:46:13] [Server thread/INFO] [minecraft/DedicatedServer]: SL_1056 left the game
[19:46:14] [Netty Epoll Server IO #5/INFO] [FML]: Client protocol version 2
[19:46:14] [Netty Epoll Server IO #5/INFO] [FML]: Client attempting to join with 14 mods : minecraft@1.12.2,grapplemod@1.12.2-v13,FML@8.0.99.99,obfuscate@0.4.2,mcef@0.9,harvestcraft@1.12.2zb,cgm@0.15.3,appleskin@1.0.14,jei@4.16.1.1001,forge@14.23.5.2860,neat@1.4-17,mcp@9.42,webdisplays@1.0,oreexcavation@1.4.150
[19:46:15] [Server thread/INFO] [FML]: [Server thread] Server side modded connection established
[19:46:15] [Server thread/INFO] [minecraft/PlayerList]: SL_1056[/127.0.0.1:57688] logged in with entity id 239 at (-274.9667800545838, 69.0, -218.06129740131615)
[19:46:15] [Server thread/INFO] [minecraft/DedicatedServer]: SL_1056 joined the game
[19:46:18] [MiniServServer/INFO] [WebDisplays]: Client with UUID [redacted-uuid-v3] authenticated successfully
[19:46:33] [Server thread/INFO] [minecraft/NetHandlerPlayServer]: SL_1056 lost connection: Disconnected
[19:46:33] [Server thread/INFO] [minecraft/DedicatedServer]: SL_1056 left the game
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