Expertise die on specialties don't seem to be working properly. If you have 1d4 expertise and chose not to use it, the roll uses 0d6, which is fine. However if you do chose to use it, it rolls a 1d6. If you have a 1d6 expertise, if you chose to not use it, it rolls a 1d4 and a 1d8 if you do use it.