Why are only 10 items visible in my POS cart?

This has been happening to some of our users as well. Of course its not consistent and I had a hard time recreating it. But once I did I found that closing the app and reopening it seems to fix it, like others have said that is only a temporary fix though. I told my staff to save the cart, close and reopen the app, view the saved cart and then all of the items should show. What a pain though!