A gap exists between a seam landing curve and one of its boundaries.
A sketched seam does not intersect its boundary.
The seam is out-of-date.
What You Should Do
Separately try each of the following steps:
Select the row in the Results dialog box. The beginning of the gap is shown in the graphic view with this icon: .
Open the seam in Sketch 2D and verify that the seam landing curve extended past its boundaries.
Click Recompute in the Results dialog box to recalculate the seam.