C D

I had to amend my figures for 2021-22. The tax calculation said I owed £ 55.40 - however, when I wanted to pay, on the self assessment page it said that I was £ 133 overdue. I do not owe any money for earlier years, so I do not understand this. What am I to do? I am, of course, willing to pay but only the amount that is stipulated in the tax calculation.