think of the backdoor Roth as two separate transactions, a non-deductible contribution (which is limited but can be back-dated to prior year until April 15th), and a Roth conversion (which has no limit other than how big your Trad IRA, but cannot be backdated - it is reported in the calendar year it occurs).
So your 2023 Backdoor Roth done in March 2024 was just a non-deductible contribution for 2023 reporting. Your 2023 Form 8606 should have had $6490 on Lines 1, 3, 14 and this carries over to 2024.
For 2024, that $7001 odd number sounds like a $7000 contribution and $7001 conversion due to some earnings in the IRA while all this is being processed (which is ok). You should have received 1099-Rs for 2024 reflecting both the conversion in March and September, totalling $13,941 which should be flowing into the 8606 on Line 8 which seems to be missing from your figures - this usually happens if the questions after the 1099-R input did not correctly identify these 1099-Rs as Roth conversions.
Your 2024 8606 should have:
Line 1 = $7000 (not 7001)
Line 2 = $6940 (carried over from 2023)
Line 3 = $13940
Line 8 = $13941
and then the rest of the 8606 math should kick out that $13940 of your Roth conversions were not taxable, and you owe tax on $1.
Hopefully this helps point you in the right direction.
Here are the latest instructions for entering Backdoor Roths tho they've been updated for 2025 and some of the screens have changed at least in desktop, but the general principles are the same
https://ttlc.intuit.com/turbotax-support/en-us/help-article/retirement-benefits/enter-backdoor-roth-...
