Losing achievement points, how or why?

Hi all,

I just noticed, I had 3685 achievement points, after playing a couple of games, supposedly earning an achievement out of the 2nd game, I looked into my Achievement tab and now I have 3645.

I apologise if this is already a known bug, I tried looking through all the commonly known items but wasn’t able to find anything about this specifically.

Is this known? Is there a fix coming for it?

If not, I guess I hope Blizzard will now know of it.