Missing mount count on achivement

Have any experienced that you have more mounts than the achievement tells. I got my mount number 50 today. All mounts I can use on the character and have done so to test it. I have reinstalled game, and tried login without addons. Nothing helps at all.
I contacted support and they can not or will not do anything about. So I have kinda lost the mood to keep playing, since there seems to be no solution for this.
I just want to hear if someone have tried it, and made it work somehow.
I can track my mount count via wowhead retail, but not in classic, so that did not help either.

i got my achiement 50 mounts, when i had something 72-78 mount in mount collection

What you see in-game mount journal is the total, including the opposite faction ones, you have. The achievement will not count both factions, only one.

In my journal it says I have 134, but only 94 is counted in the achievement.