And I've just tried the incognito login and report shows the same. I believe this is an error by QBO and would really like some help to resolve it, as we've pai...

Yes, it shows £1722 VAT claimed on purchases in the exceptions, so makes the difference even bigger

No, our accountant has confirmed not. So QB states that we have to pay HMRC over £15000 but the detail reports shows only £3000.