Is there a W-2 summary elective deferrals problem?

W-2 Summary, box 12 elective deferral, smart check and e-file error message:  "Forms W-2 & W-2G Summary: Elective deferrals - TP $37,000, is more than the allowed $18,500 for a 401k plan. Please check your entries on your W2 for 401k plans."  I contributed $18,499 each to 401k to Roth 457, for a total less than $37,000.  What is the problem?