The Form 1099-R for the IRR and its entry into TurboTax has nothing to do with determining whether or not you have overcontributed to the 401(k).
You post indicates that you are using TurboTax Premier online, so I'll assume that you are not self-employed and that these contributions are made through an employer that provides you with a W-2. Since you are under age 50, the sum of any amounts reported with codes D, E, F, S, AA and BB (codes D and AA in the case of a 401(k)) in box 12 of your Form(s) W-2 are not permitted to exceed the annual limit ($19,500 for 2021, $22,500 for 2023). After-tax contributions to the traditional account in the 401(k) are not reportable on your W-2, so if you contribute the annual maximum to the designated Roth account in the 401(k), the only code related to your retirement contributions in box 12 of your W-2 should be code AA.
