LOD object disappear

I have bought an asset that contains LODs. I rescale the whole project because the size was not matching my need. Since then, some LOD object disappear when I look directly at it and appears when at the edge of the screen (VR)

I understand that the re-scale I made may have broke these LODs? But since I didn't do that asset, I don't know much about LOD, is there a way to "fix" them?

video example