Happy to clarify crnopivo!
It's certainly possible that what you were seeing didn't match up to what was actually there, whether through some sort of visual glitch or cached info that didn't update until the amount changed, for some reason or another.
I've not seen specific cases of that in the past, but if you do happen to run into anything similar in the future, especially if you happen to have screenshots/video (though understandably this isn't something most would think about grabbing normally) - we can definitely pass that along to be looked into. Thanks!