This is my first complicated (relatively) song in Biab. The only repeat is a dal segno al coda, and it all works nicely except for one section. On the repeat, in one section, the chords played are not the song's chords during the repeat and it makes no sense to me. I can imagine the style might vary, but not the underlying chords. I tried with a different style, and it's the same.

It's the lead sheet for I Remember Clifford from the Real Book Volume 1 6th edition if you want to know.

--- Everything works as expected at first:
1st 8 bars
Sections A, B, C - dal segno al coda (segno is at A)
Section A, B
--- The problem occurs here:
Section C plays different chords. I don't mean just the bass notes being different. The actual chords are not the same and don't match the melody (not 100% off but messed up enough to notice).
--- The rest is ok
To Coda
Coda is 2 bars and section D and plays the correct bars.