Did I get taxed twice because of back door conversion?

Hello,

I have some money is my Traditional IRA.  In year 2019, I contributed $7k of after tax money to my Traditional IRA and did a back door conversion to a Roth IRA.  Turbo tax seems to think that part of this 7K after tax dollar is income and need to pay tax on it.  Looks like I got taxed twice.  Is this bug in Turbo Tax?

 

For example:

Let say my IRA has $100k, I added $7k after tax dollar to it and converted on the $7k to Roth.  7k/100k = .07.  7k - .07 X 7k = $6510.  Turbo tax is counting $6510 as income that require tax to be paid.  effectively I am paying tax twice.  Please let me know if this is the way is should  be or is a bug in Turbo Tax.

 

thank you!