Backdoor Roth IRA question

Here is what I have done for my IRA: I contributed 6000$ after-tax money to a traditional IRA and then converted it to Roth IRA. My income is 300K for last year. 

 

The problem I have met is: the turbotax software treat these 6000$ as pre-tax, and taxed a certain amount of money from this 6000$.

 

Based on my learnings, this should be considered Backdoor Roth and shouldn't have an income limit. In addition, this shouldn't be tax (since I contributed my after-tax money). But the 1099R I received, showed I have taxable amount 6000$.

 

I am using Turbotax online version. What should I do to add this 1099R form correctly?

 

 

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