Weird Light Physics

[MsHannerBananer]

So in my custom story, I had street lamps in a map and they were perfect!! They looked like this

Spoiler below!

Then I converted everything to a Full/Total Conversion and I got this.

Spoiler below!

If you're going to ask, yes, the street lights look like that when in game.

They were grabbed from White Night. Any particular reason for this strange and sudden phenomenon?

[Neelke]

Are there any billboards on the entity? It can sometimes change to white color automatically. At least worth a look.