video player issue only in roku-express

I am using different roku devices for my app and I am facing following 2 issues only on roku-express.

1. When video is played in application and I watched 3 layer in each video.
   Attached images shows 3 layers in video.
   This only happens when I use roku-express device.
   
   

If I replace roku-express device with roku2 or any other more powerful roku then there is no any above issue.
First I thought that roku-express has less memory than other devices and these issue are because of low memory.
But when I checked and found that roku-express has more memory than roku2.

I am unable to find exact issue in roku-express. What can be issue?