Assuming you completed Part XI of the Federal Information Worksheet with the residency information, take a look at the Missouri Nonresident State Allocation worksheet, which you can quickzoom to from that part of the Federal Information worksheet. You may have some entries there that need to change to correctly allocate the income to the non-resident state.
On the state side, there is also Form MO-A for income tax adjustments that may need some entries to properly allocate the income.
