Your welcome! I really enjoyed the game, so it wasn't a chore to put in all that time to find bugs heh
After playing a few more hours(yes, many hours) I think I've figured out one reason why that glitch happens. It seems like sometimes I can walk into the side of a block and it attempts to go into slide mode. I noticed it a few times, perhaps when the top of that block is eye level to my sprite. In any case, it's mostly a visual glitch.
I think the reason I had trouble moving the first time I encountered the glitch is because I was trying to press left and right at the same time, just a little bit. That causes the hero to not move at all and be in walking animation. After you know that, it's easy to avoid.