Syncing between online and apps randomly not working

I’m on the Quickbooks Easy Start plan. I can access my account online through a browser and I use the mobile app on my ipad and iphone. My problem is that the mobile app on both devices is randomly not syncing and showing me all my data. For example random customers disappear off the mobile app but they are still there if I sign in on my browser. When I try to add expenses on the mobile app on my ipad the “type of expense” field only lists a couple of categories, missing a bunch that I’ve added (even missing the Fuel expense which was a category automatically in the list by Quickbooks) but if I switch to the mobile app on my iphone all the expense fields are there. Working in the field I went to invoice a customer I’d previously worked for. Their information didn’t show up on my iphone so I added them again. Once I signed in online in my brower now they’re in my account twice. The online information is always correct but the data available through the mobile app on either my phone or ipad randomly isn’t available as if it wasn’t there at all. Yes I’ve deleted and reinstalled the apps and signed out and signed back in. Syncing was working fine up until about a month ago.