Retirement tax questions

Thanks @JamesG1 & @JohnW152 

After I replied I went to the link James previously provided and found my error with the "Claim of Right' field. 

Calling IRS was no help as they just said to mail in the reason for my dispute. 

I went back into Turbo Tax to work on an amended return but of course it is still taking the original incorrect credit into account and when I remove that and put it in the correct 'Claim of Right' it calculates that I now owe a little. Makes me nervous to submit it that way and end up getting a bill when I should be getting a decent amount back. So frustrating!