CP2000 - "Retirement Income" but was converted

Hi - I received a CP2000 from the IRS stating that I have "retirement income".  This was $6K that was placed into a traditional IRA and then quickly moved to a Roth IRA.  What do I need to send to the IRS to show that it was converted?

 

I did have an 8606 as part of my TurboTax filed return.  It shows $6K in line 1 and $6K in line 2.  I think the line 2 is incorrect as the traditional IRA does not have any balance.  But then wouldn't TurboTax have calculated the tax impact (incorrectly)?  Wondering why the IRS is showing that I need to pay more taxes.  (Over $2K more)