Maximize contribution to Individual 401(k)

I am an over 50 sole proprietor with a solo 401(k). I'm using Turbotax Home and Business.

Current 2021 contributions:

Individual 401(k)

Elective deferrals: $2,083

Catch-Up Contributions: $3,500

Roth 401(k)

Elective deferrals: $17,417

When I check the box for Maximize Contribution to Individual 401(k), I am told: Using the maximum allowable contribution, you can defer a maximum of $23,562 to a 401(k) plan.

When I get to the summary screen, it says:

Here are your self-employed retirement deductions using the maximum allowable contribution.

Individual 401(k) $5,583

Roth 401(k) $17,417

Already contributed: $23,000

Maximum Allowed to Qualified Plans: $10,208

Amount to Contribute by Plan Due Date: $4,625

Where are these last two figures coming from, and what do they mean?