Grinding problem XP/10

Hi guys

I don't think that it comes from HB, but since the patch 6.0.2, i noticed that
when i grind on a same type of mob, the XP is divided by 10.
It appears that after a certain number of kills (of a specific mob) XP is reduced at a tenth for this mob.

Grinding is now very long. I did see anything about this in patch note.

And i avoid questing as there are too many bugs for now.

Do you also notice this ?

 

https://www.thebuddyforum.com/honorbuddy-forum/172071-mob-grinding-xp-changes-wod.html#post1589029

 

thanks for the link, never notices or heard about it before.