Hi, I'm having a very similar issue, but it happens with spells, features and traits, items, etc. It appears that if I've added something then removed it at a later date a blank item/spell/feature will appear in its place after leaving the character and returning to it. Additionally the order I have placed them all in will be swapped around randomly, which makes keeping track of abilities and spells a nightmare. No matter how I edit the sheet, once I close it and open it again it will have regained the empty boxes and shuffled everything around again.