How do I override / correct form 1116 line 18? - wrong amount is being imported (doesn't match 1040, line 10)

On my form 1116 (passive category), the amount automatically imported on line 18 doesn't match what it should be (per instructions, this should equal the amount on form 1040, line 10). The amount TurboTax automatically imported is less than what's on form 1040, line 10 and doesn't really match anything...I have no clue where TurboTax is even getting this value from. Even when I go to the 'forms' view and click on the magnifying glass, it takes me to the worksheet, which shows the correct amount from form 1040, line 10, which, as I already wrote, doesn't match what TurboTax ends up putting on line 18 of form 1116. I tried overriding the value in the forms view, but since it's a calculation, it won't let me. I'm really puzzled by this. I've never had this issue in the past. Any help would be greatly appreciated.