We can't see your statements, so, we can't tell you what that is.

In any case, it would be highly unusual for statements for F.1116 to be numbered 1.

If I were to read your mind, I think you meant either Line 1a or Line 16.

More likely, you're asking about Line 1a because Line 16 generally requires user input from offline computations.

If it's really Line 1a, then, you could be looking at adjustments for qualified dividends and capital gains.  These adjustments mathematically restore parity between limitation figured based on the highest marginal tax rate of 37% vs. capital gains being subject to lower preferential rates.  There would also be corresponding adjustments on Line 18 for the denominator.

You can refer to F.1116 instructions for a more detailed discussion of these (and the adjustments on Line 16, which are much more involved technical subject matters that you will need to compute offline).