Hi there, @jstabler.
It's possible that date was different from the first time you've check your transaction to the moment you get back to it. We can go back to your Sales Tax Liability report and check if the dates are similar.
If this isn't the case, I recommend resetting QuickBooks update. This can help fix minor bugs or unexpected behavior with the product. Here's how:
You can also review your sales tax reports to make sure everything is accurate before paying VAT.
I've also added an article on how to troubleshoot unexpected errors you may encounter while managing your sales tax in QuickBooks Desktop: How to resolve common sales tax issues.
I'm always here to help if you have any other concerns or questions. Just tag my name in the comment section and I'll get back to you as soon as I can.