because Turbotax can't handle (won't allow) boxes 1, 2 and 3 on just one k-1 form. box 1 and other related boxes must go on one k-1, box 2 and other related boxes must go on the second k-1 and box 3 and other related boxes must go on the 3rd k-1.
you may have been furnished a supplemental schedule which would have 3 columns for the boxes 1, 2 and 3 and then lines with amounts for the columns. it may be on the back of the k-1 or a separate schedule.
