Simple only color material renders not the same depending on character's position

Hello,i have a problem with material rendering on mobile platforms,in the video you can see that hearths material renders strange and it depends on character’s position,how to fix this?While previewing game at desktop hearth is fully red but on mobile it is half red half black.I discovered that this happens only when actor’s z coordinate is bigger than 2000.Thank you for any help.
Video link:19-07-26-22-56-13.mp4 - Google Drive