on iOS device.. image gets weird..?

[Heeju Lee]

Hello, I'm Layla Lee. Um.. sorry for my bad English. My mother tongue is Korean...

So, I got this problem... dunno how to explain this

First, my settings are..

1. Shadero Sprite 1.2.0
2. Using Text Mesh Pro
3. Unity 5.6.5p4
4. Only on iOS device

from the image, background is 'none'. No image, no material.

Situaciton

1. we created custom shader for Camera filter.(for fade in, fade out or corner color filter)
   when we using those filters(or one of), UI objects (especially image, font) looks like above. it ... um flickering? glitch?

2. It's just a moment. like 1 sec? not a long time. I guess when we clear our screen filters, it goes away.(back to normal)

so... I've been searching cause for days.. still, I can't.. help me plz..

my email : eookog@gmail.com

if you want our custom shader script, you can ask for it.

Thanks