To clarify, the withholdings on line 25b of Form 1040 doesn't match all of your withholdings from all your Form 1099's (1099-R, 1099-INT, 1099-DIV, etc.)?
If yes then you will have to ho back to each Form 1099 to review your withholding entries:
- Click on "Search" on the top right and type “1099-R”
- Click on “Jump to 1099-R”