I bought new battle sprite - maskeraith from supply depot,

Problem is that my new battle sprite don't get too much heat at level 1, it gives all the heat to all my other 5* items - weapons, shield, etc.

Example: Maskeraith (level 1) - gains 1% heat at the end of level on elevator, while my sword or gun or bomb or shield or armor or helmet at (Level 9) gains 99% heat at the end of level on elevator in the party.

I have to feed my maskeraith with materials in order to gain massive heat.

Is this because i have my old battle sprite? Level 105 seraphynx from the lab?