I think it counts the original post as a comment, so the total shown is (original posts plus number of comments). Is it actually missing one comment in your audio ? which one? first or last?
Entering a max of "26" manually is what created the off-by-one error, I think, because of the original post being counted as a comment.
But yeah, I'll fix that.
If I leave the max at 100, then I get every comment (original post + al 26 comments), here's the output audio: https://drive.google.com/file/d/1fIis8yQn-YuOmJwq1J4cLtthQV0...