Ive had a similar issue happen a few times, not sure if it’s related. I’d buy all the things from the stand (lets say 200 items) only to find 20 (arbritary amount) left in the stand after my purchase. I never check my money though, could be that i paid full price for 180!
Pretty sure I’ve never been overcharged when that’s happened but I’ll make sure to write numbers down to make sure next time it happens to me. Which is fairly often and has been since launch iirc
The reason I noticed now that i payed for 1700 is because I could not buy 1800. ( 2ss) so i went for the 400stack 900 stack and filled up by stacks of 100
To lazy to precisely select amount. And noticed it happening previous times I bought brick but did not pay attention if I payed coin for missing numbers.