I'll be glad to share with you the steps that would fix your VAT Liability report issue.
What you're experiencing right now can be a cause of a data cache issue. Usually, too much cache build-up in a browser can unexpected behavior with the product.
To clear this out, let's run some basic troubleshooting steps. We can start by opening your account using a private window. Doing this will help us isolate the issue and fix it.
Simply press the following shortcut keys to access incognito:
Ctrl + Shift + N (Google Chrome).
Ctrl + Shift + P (Firefox).
Control + Option + P (Safari).
If you're able to open the report, then let's clear the cache in your web browser or try using a different supported browser. This might be a temporary issue with QuickBooks and the current browser that you use.
Additionally, here are some articles that will help you in managing your reports in QuickBooks Online (QBO):