The tag "percxpPet" is always visible in the hunter pet xp bar, reather then any % number.

Use lowercase.

I never set the tag on the pet xp bar, i cant change that tag. Theres no options to do so, in the Tags section of pet frame.
Thats why im writing here.

Could it be that you forgot to use lowercase in the code for the pet xp bar?

Yeah i did.