Double page mode has no effect on some pages

[beaverdude]

Two volumes of the same comic book in CBR. Similar jpg naming inside, same page sizes. One is being displayed in double-page mode, while the other one does not react on that mode, single page only I see. I can't spot any difference in CBRs, any idea why the double-page mode can be ignored for one file?

SYSTEM INFORMATION
Qt version: 6.3.1
Build ABI: x86_64-little_endian-llp64
build CPU architecture: x86_64
CPU architecture: x86_64
Kernel type: winnt
Kernel version: 10.0.22635
Product info: Windows 11 Version 2009

GRAPHIC INFORMATION
Screen pixel ratio: 2.5
OpenGL version: 4.6 desktop