this is a bit confusing to follow what your referencing on each line back to 2023 but from what you're describing...
for 2023 you only had a non-deductible contribution. think of backdoor roth as 2 separate transactions, the contribution to the Trad IRA can be done in March 2024 backdated to 2023, but the Roth conversion part done in 2024 would apply to your 2024 taxes.
your 2023 8606 should have only reflected the contribution and a basis carryover to 2024, no tax unless you were doing any other distributions or conversions in 2023.
your 2024 8606 line 2 should have had that carryover, plus the 2024 contribution done in Sep 2024 on line 1. You should have had 1099-Rs totalling both the Mar and Sep Roth conversions that should have landed on line 8.
I'll pause there if that helps unravel what happened between 2023/4 and if still stuck pls post more details what you are seeing on the 8606s.
If you need to amend 2023 taxes you can only do that on desktop and print/mail the 1040X etc. If you only need to fix the basis on 8606 or didn't file 8606 and it has no tax impact, I don't think you need to amend taxes for that if the 1040 didn't change but not sure all the rules - see comments at the end of this article about prior year 8606.
https://ttlc.intuit.com/turbotax-support/en-us/help-article/retirement-benefits/enter-backdoor-roth-...
if you paid tax in 2023 that was a mistake you can still get a refund on 2023 (2022 deadline for refunds is this April).
to do an amendment for prior year in desktop it's important to save a copy of your .tax file for the original return, see guidance here (and always have backups anyway - also ensure you have PDF with all forms and worksheets as your official filing record, the .tax files can only be opened by Turbotax and they stop supporting the s/w after a few years).
https://ttlc.intuit.com/turbotax-support/en-us/help-article/tax-return/amend-change-correct-return-a...
