Sorry about that! You are still the only case of this happening. I can only assume it's a localized issue because I'm unable to recreate this problem on my end. I wouldn't recommend buying this version of the game if you are seeing problems in the demo. All versions and demos perform consistently so any problems you have on one will most likely be seen on all of them.
Try seeing if others have the same issue with other Unity games and troubleshooting ways to resolve it.