Retirement tax questions

I have the same problem.  1040 line 25c shows a large amount that makes no sense, and I cannot find it on any other form.

 

We're retired, have only 1099R income.  No W2s, no KI, no additional medicare tax, no form 1042, or 8805, or 8288, or 8959.

 

Tax payments worksheet shows this amount on line 18a 'other withholding'.  I have reviewed all our withholding, all our 1099s, our medicare and SS accounts online, and the amount in that line is nowhere to be found.  I have gone through every form on our Turbotax return, and the amount is nowhere else to be found either.

 

So, where is turbotax getting this amount?  I've always used TT and have never seen this line have an amount in it.

 

Thanks,

Rich L.