I work full time and also have self-employed income <30,000.

When I completed TurboTax, with all my T-slips, RRSPs, self-employed income and self-employed expense deductions, TurboTax calculated I would get a refund of $0.82. This was by design as I added more RRSP values so I didn't end up owning anything. That was March 7, 2024.

Today, March 17, 2024, I log back in to complete the filing and the amount I now owe is $4,400.

Did something change? This seems like a gross change from one week to the next with absolutely no inputs from me. What has happened here?