multi camera and bloom optimized(UI camera malfunction)

I have 2 cameras in my scene. one is for game objects and one is for world space ui. the problem is when i attach bloom optimized component to game object camera, the world space ui camera will render ui as other graphic(not perspective) which means i can see ui behind the game objects. how could i solve this problem??

additional question bloom and bloom optimized looks different from editor and mobile device. why? should i turn HDR on for bloom?