Wix invoice shows a other vAT amount than Dexxter

Your purchases were €144 + €30.24 vAT = €174.24 incl. VAT.When entering the invoice in Dexxter, you probably entered €174.24 as the amount excluding VAT (instead of including VAT), which means that Dexxter will calculate VAT on this total amount: 21% of €174.24 is €36.59.p>

That was a beginner's mistake, I realised it myself later. But thanks anyway!