1099-R for after-tax rollover to Roth IRA

Hello, I had some of my money in an after-tax defined contribution plan (DCP) that I rolled over to a Roth IRA. They let me know any earnings would be taxable. My 1099-R shows $60 in Box 2A with a code G. However, when I add this information into TurboTax, my tax liability increased by $69 (more than the taxable amount in the 1099-R). I tried setting Box 2A to 0 just see what happens, and it reduced back by $69. The number doesn't seem to make sense (assumed taxes should be less than the taxable amount, not more), so I wanted to make sure it's not a glitch in the software.