The fix overlapping tick. . . .

Hi chaps. This evening I decided to remodel my terrain. So deleted all and started again. The only thing a changed was some shapes in one or two cross sections and when I 'create' my terrain, I use 4 panels, the overlaps are all over the place, above each other because of the cambers not fixing like they were when I began my project.

Is there anything I may be overlooking that is causing this?
Wish I had a screen shot to show you. the terrain is staying in line with the camber and not joining the overlap like it normally would if the check box is turned on. So I'm having to merge nodes together, when it used to just merge all overlaps automatically. Any ideas?
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