Background Off on Roku Ultra

We're developing an app that works fine across all Roku devices.  However, on Roku Ultra the background which consists of a preview image of the video in the upper right corner fading into black across the rest of the screen is not working properly.  It breaks the images up and has a gray background behind thumbnails.

This only seems to happen on Ultra.  On another Roku device it works the majority of the time but seems to not load graphics/thumbnails fully...   Any idea to what might be going on?

Thanks