In fact, on Zappiti players, Blu-ray menus in Java BD are virtualized into Java Android to be displayed, which requires a lot of processor resources. For this reason, some menus cannot be displayed perfectly because they are too complex.
Alternative solution :
To be able to read this additional content (Bonus, making-of, bloopers, cut scenes, etc.), you just need to press the MENU button on your remote control when playing the video file concerned, then select the "BD Title " tab. Here you can find the additional content of the Blu-ray.