App isnt showing most invoices, website shows them all. Is there a fix without reinstalling the app last time I did that loads of invoices duplicated?

Hello Chris c1, thanks for reaching out to us on the Community page, so there is a few thing you can try, can refresh the date see if that resolves it or clear the data on the apps on your phone again see if that resolves it otherwise it will be a case of having to uninstall the app and reinstall it again. 

Clearing the app's data can be done on the app or on your phone settings. The instructions are outlined below:

• For QuickBooks Online app:
  
  • Android - Select the menu at the top right and choose Settings. Then select Refresh Data and choose Yes.
  • iOS - Select the menu at the top right and then choose Help & Feedback. Then select Refresh Data and Refresh.
    
• In your Phone Settings:
  • Android - From your phone's settings, select Apps (varies by device). Choose the QuickBooks app from the list and select Storage. Select clear data.
  • iOS - From your phone's settings, select Settings, then, click on General and choose iPhone Storage. Select an app that's taking up a lot of space. To free up the storage without deleting the documents and data for the app, select Offload App.