Strange measure numbering
MS 3.5.2...; Win 10.
Admittedly this (attached) is rather a strange "piece"; it's really six separate pieces on a single page. (It took some doing to lay it out this way.) What is puzzling me is what it's doing with measure numbering. I could turn it off altogether but that's beside the point right now. It just has me curious what's going on.
Measure numbers just appear and disappear almost randomly on the first full measure of pieces C and E, depending what edits I make elsewhere. And when they appear they don't seem to make sense. In C I've seen 4 and 7, and if I subtract 3 from the first measure of B then C comes up -2. In E I've seen 8 and 11, and other values if I subtract 3 or 4 elsewhere. As I attached it, with no subtractions anywhere no measure numbers are showing. But make a few edits here and there and they're likely to pop up, or if they're up, to go away. I can't explain it.
Does a section break reset the measure numbering to 1? Sometimes it seems to; sometimes not. (I've put two in the score.)