Contours jumping to points other than where I click

I just returned to working on my game maps. Had the files backed up on another drive when I rebuilt my computer, reinstalled all, loaded.
Basic map is there, but I go to add some contours and it seems the starting point keeps jumping to a grid corner, which in most cases is quite a ways off on the map. Obviously I have some setitng goofed up, was wondering if anyone knew which or had some suggestions?

Thanks for any help

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