Interesting, I didn't realize there was a raging controversy about 1 vs. 2 spaces after a period in a monospaced document, but now I know.  Apparently I am one of the dinosaurs who learned to type on a typewriter and had the two space rule drilled in hard.  So on any new text you create you are free to use your own style (even though 1 space will burn my eyes).

*BUT* you should definitely figure out where in your process your editor is making editorial decisions about spacing and actually *changing* existing text.  That's really not good.