Get your taxes done using TurboTax

I went through this step and entered, now it's not adding extra tax but I am not sure if my 8606 form is correct or not.
https://ttlc.intuit.com/turbotax-support/en-us/help-article/retirement-benefits/enter-backdoor-roth-...

Here are the entries in 8606
Row 1: $6000
Row 2:  $0
Row 3: $6000

Row 16 & 17 : $ 6000

Question:
1. Shouldn't my Line 5 be $12,000? Because Row #2 should have $6000 right? 
2. Will by any chance my 8606 add to the total of all my Backdoor i.e. year 2021,2022,2023 to $18000 or not?