X2 fails to stitch file together

When I save my file, and then use the X2 system to stitch them together, it shows the complete and uninterrupted fil

e on the screen. However, when it actually cuts the file, the cuts line up, however it never joins the cuts after I slide my X2 system to finish that other half of the file. See photos please.

Is it a calibration issue, or something I’ve overlooked in setup?