Thanks for the quick reply but I think we are at cross-purposes or you have misunderstood what I'm objecting to.

I generated this song/chord chart from scratch and I'm very happy with the repeats and the double and dotted barline repeat marks.

What I can't see any reason for are the (non-dotted, non-repeat related) widely-spaced double barlines at the beginning of bars 2, 18, 32, 50, etc..

Any ideas?