As described in this issue Civtest is currently unusable/unplayable thanks to bugs with items, I think humbugs drop duplicator is causing drops to change items when duplicated, not to mention the spawn book is invalid and screws up the inventory (it starts as a spawn emerald and then changes what item it is as you add and remove other items from your inventory. )
Emeralds to XP is not working probably for the same reasons, there are dozens of simple little fixes that need be applied here, and possibly elsewhere, I am concerned that the TNT we keep seeing with Oreobfuscator is because it is not as fully updated as we would like.