I posted this on the bug forums, but for the fun of it, I’ll share my story here too.
imgur com/xQmk4a6 can’t post link so gotta copy/paste.
I started playing Wrath Classic for the first time on Oct 10th after getting level 10 I noticed in my achievements I had 60% and 100% ground mount speeds. I just shrugged it off and continued when I hit level 20 I grabbed my warhorse summon and was surprised about the mount speed. Went over to the riding trainer to check and was again surrpised to see I had no riding skills available to buy. I had a google, but was unable to find anything so I just went on as usual till today. I logged in today to find that I was put back to normal yet still have the achievement as proof. So blizzard could you fix me back to normal? It was a lot of fun leveling like this.
