Elixir bug / Mixology bug

I'm currently leveling up my Alchemy. This bug started recently happening, whenever I use elixir, I get less stats from it than I'm supposed to get. The desciption of the potion while in bag, shows the correct amount of stats. For example Elixir of Wisdom should give 11 int, but when I use it, it gives 6. As if I didn't have mixology as passive skill.
This bug didn't always happen. On earlier levels, everything worked fine.
I tried using ''Repair character'' on the website, but that didn't work.

Will this bug go away eventually when I hit max alchemy?

Where exactly do you play?
Which server? Wotlk/cata/legion? Rates?

Cataclysm x5

Try again when you reach max level of alchemy.
If you encounter the same issue - contact me via PM.