Not sure if this is a bug or intentional but yesterday I decided to upgrade kakuzu's mystery to +2 in preparation for the skill trial update that occurred today, but now when i look at the breakthroughs it's now at +1. I noticed that the new +2 has more skills with it so hence the question if the "downgrade" was intentional.

Edit: and if so is there a way to get the 100 frags i used back so I can upgrade it properly now