I lived in two states in 2020. What if the total in boxes 16 for both states, exceeds what is in box 1?

[SweetieJean]

What are the two states?   It is possible for State wages (even in a single state) to be higher than Federal wages because of the difference in how some employee benefit plans are treated.

[Hal_Al]

It may also only mean that there was double  withholding on the overlapping amount.  That is, you employer withheld state tax, for both states, on a portion of the box 1 amount.   This may require a workaround in TurboTax.

Sometimes you have to ask your employer what it means.