Pages Per Row odd offset sometimes doesn't work about yomikiru

[Phallss]

It seems the issue lies with the detection of what is and isn't a double page. Whenever I delete all other sized pages and only keep the single pages, everything works as it should (i.e. that's the workaround). If you could point me to the part where this detection happens I might take a look at fixing it myself.

I'd detect double pages simply by checking whether the width is greater than the height. If true then it can be a double page, otherwise it'll be detected as a single page. That way the offset should hopefully be fixed as well as there's no confusion anymore in case there's more than 2 different page sizes in the chapter.