Review says my gambling losses should not be greater than winnings. They match yet I keep getting the error

If you reduce the gambling losses by $1 or $10, and report a net gain of gambling revenue, does the error message go away?

If the error message does not go away, then the problem is not the dollar amounts but some other question or issue in the software.  In that case, you would step through the interview questions to see whether there is something you missed.

Then you can re-enter the correct gambling loss amount.