[Ken Maltby]

I don't see a "top notification bar" in either screenshot. In Koreader's epub reader you can have a "Full" progress bar, with some info at the top of each page as well as the mini-progress bar at the bottom. The default is with just the mini-progress bar at the bottom.

You can disable the embedded css using the bottom menu "Gear" icon menu selection. You can also use the top menu "Set render style"> "clear all external styles" and use one of the supplied .css to try for a better result.

I notice that the Koreader screenshot is using a different font and is using a hyphenation dictionary to use full justification, while the other is center and left justified. This could have caused the differences.

The image of Koreader rendering the same book in your post #61 looks correct.

Luck;
Ken