I have missing invoices and customers in the app only, latest version and tried logging in and out so must be a bug right?

Hello and welcome to the Community, karl27

This issue was reported to our Engineering Team and a fix was released today as part of the new app version. For the fix to take effect please delete the QuickBooks mobile app from your iOS device and install the most recent version (24.05.9) from the App Store.

Thanks for reaching Intuit QuickBooks for support on the Community. If there is anything else that we can help with, please get in touch. 

I thought the update last night fixed the missing data issue on IOS App (after delete, reinstall and wait for data to sync), but I will be on the phone to support tomorrow as one of our accounts definitely still has missing data (because overdue invoice total is about 2/3’s what it should be).

I have just finished 3rd attempt at reinstalling, with the same result each time.