A required minimum distribution (RMD) would not apply to a Roth IRA conversion, so it is likely the issue is with the other two IRA distributions you entered. I suggest you revisit those entries to insure that you answered the RMD questions accurately.
Assuming you made your RMD's for the year, for the first question, enter the amount of your RMD that applies to that distribution:
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For the next question indicate that the entire distribution was applied to your RMD in the current year:
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As long as the distribution was equal to or more than the RMD, you should not get a penalty for being deficient.
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