Is there a reason?

[Quedari]

No, killer effects are not affected by any stat, they are a static unchanging percentage. Lizard killer is a flat 8%, although it's probably halved for BLU down to 4% like fast cast. You probably ate bison steak, it gives 5 more lizard killer, or wore felistris mask which does the same. Or you forgot to change out of Zoran's belt after WS, it gives lizard killer +10.

Just fyi, BLU can't wear Felistris or Zoran's.