Both these happened on an iPhone 14 pro, using Chrome when wanting to edit a price that was wrongly processed, deleting the price and then starting to type changes the item on which the edit was being made, so I can't fix the wrong price correctly (I also think they are getting rearranged and somehow that's causing the issue) when the category selector is open, depending on where the Select was when opening you may not see the full list and the scrolling/swiping is blocked
