It could be coming from Less Common Income. In the Wages & Income, this is listed apart from Form 1099-MISC, which is available as Other Common Income. Scroll all the way to the end of the income section to see Less Common Income and Show More. From there, the amount will not be shown unless that section is selected.
If you reported Form 1099-K from personal property sales or reported prize winnings, for example, these amounts could be combined to the line item you are seeing.
For more information, see: If I didn't get a 1099-MISC, do I still need to report the income? Even if it's less than $600?
