Why don't my total sales match my total turnover?

Hello.

I’m using quickfile to track my income for my self-employed piano business, I get paid various amounts directly to my bank account by clients once a month (depending on their availability) with no invoice, and a small number of clients pay cash on their first lesson of the month, so I just added every payment into the account as an individual ‘Cash Register Input’ with their bank name as a description, for tracking.

Its important that I earn £29,000 on my tax return for a visa application this year, and based on my manual tracking in a spreadsheet, I was doing fine with that.

However, the grand total of all the sales i’ve inputted from 05/06/2025 to now, comes to 31,024 (the figure that matches my manual calculations), but my total turnover in the Profit/Loss report is only 29,481. This is a discrepancy large enough to jeopardise my income meeting the requirement after my expenses of £4,843 are taken away, and I can’t figure out why any of my income wouldn’t contribute to the total turnover.

Thankyou for any help provided.