So I noticed there was a small issue with the heads and these entities mentioned, and in the new update it will use the default minecraft head for those entities if they are killed add these lines if you want them to have seperate values:

wither_skeleton: 0 # This could cause the item to drop twice one with the lore other with basic minecraft stats
skeleton: 0
ender_dragon: 0
creeper: 0
piglin: 0


Again I do apologize for the inconvenience