Roth IRA Excess Contribution 2021

Why am I being taxed on excess contribution of 6,250?  AGI is below phase out levels.  I'm over 50.  Self-employment income after 1/2 self employment tax is 6,296.  The Keogh, SEP and Simple contribution worksheet shows 6,250 contribution to 401k (line 6) that I did not make.