Cool, thanks for pioneering!
Could you please check if you this problem when you start KOReader in landscape modes?
https://github.com/koreader/koreader...ent-2229993784
Open KOReader and setup a gesture you know to Exit KOReader (I have two-finger rotation counter clockwise for this). This is in case you get stuck.
2 and 4 are just two landscape modes.
Enter a Kindle book, rotate screen to landscape.
Exit kindle book
Open KOReader.
Please see if your touch input is mirrorred with respect what you see on screen (e.g. top menu is now triggered on the bottom). If that’s the case you can exit from KOReader via gesture, then go to kindle book and rotate back to portrait