However, if the issue persists I recommend checking if this is a mobile application issue. Let's start by resetting the data in your mobile app.
For Android:
Go to Menu☰, and tap More Options⋮.
Tap Settings, then Refresh Data.
Click YES to confirm.
For iOs:
Go to Menu☰ and tap Help & Feedback.
Tap Refresh Data.
Click Refresh to confirm.
Once done, you can close and reopen the mobile app and check if you can remove and add logo. Also, I'd suggest restarting your phone. If you get the same result, uninstall and reinstall the QuickBooks Online app. This is to ensure you get the most recent version of the application.
Check out this article for additional resources. It contains screenshots and complete information on how to change the layout, design, and data fields that show on the invoices. Customizing Invoices Within QuickBooks Online.
That’s it! Keep me posted in the comments if you have any other questions. I'll be here to lend a hand.
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