hi, sorry for my bad english, I use a translator, when you add the royal family gem in the helmet, it does not increase the 10%, it happens is that it is multiplied. i don't know if it's a bug or if it's designed that way.

MC 1.20.1
Forge 47.1.3
Apotheosis 7.0.4
ApothicAttributes 1.0.4

The royal family gem is a +20% MULTIPLY_TOTAL to all attributes, which is a value * 1.2 operation.