To resolve the duplicated VAT @ 15% line on your Bills in QuickBooks, please start by refreshing your browser and then attempt the action again. If the duplication persists, try logging out and back into your QBO account. Should the issue continue, please access QuickBooks using a private/incognito window, as sometimes browser cache or extensions can affect how transactions are displayed and calculated.
If this appears to be a local browser issue, following these steps might help resolve the display problem. If you're still experiencing issues after trying these steps, please let us know below so we can help you.