Included with modpack: All The Mods 7 Version 0.2.44
Multiplayer server

Issue: Spellbook quick-select menu (accessed with V) is broken. All spell names are offset by 1, and attempting to select 10th spell slot selects and casts the 9th spell slot instead. Only way to select the 10th slot is to open the spellbook's editing menu and re-save the 10th spell.

Steps taken to try and resolve:
Disconnected and reconnected with client
Closed and reopened client
Completely removed and reinstalled All The Mods modpack
Restarted server