Running a private online server with friends, updated the mod from version 1.6.14 to 1.6.16, but the items (morphine, plaster, bandage) are missing under the creative tab.

It is also missing the hearts when viewing the tutorial, and monsters 1 shot you as if you barely had any health to begin with.

(as a note, this also initially happened in SP but I removed the .jar file from the mod folder, ran the game, then reinstalled the First Aid mod and reran the world and it worked, but repeating the same steps on the multiplayer server yielded nothing)

Found out the issue was likely due to the config file from the previous patch not being deleted - it works properly now.