Everything seems to check out here. I looked at all 20 transactions on the dollar account and the sterling equivalent correlates with the exchange rates. There is likely to be some variation due to the large amounts involved (some invoices over 50k) and the rounding differences. So the GBP and USD amounts are never going to exactly resolve at a 1.6/1.7 ratio.
From the bank settings page you can journal a change to just the GBP total and move this into the currency loss/gain account. That’s typically what happens on foreign currency accounts at the year-end.