Map Bug

[findecanno]

I was playing this last night and I keep getting a bug where certian maps appear as plains to me and I start acting all glitchy and stuff. I figured out what the maps are by what my clanmates in vent say. The two that I am aware  of are nord town and port assault. ANyone have any idea what could be causing this? I tryed reinstalling the mod and warband.
screenshot of whats happening.

 

[Stin]

HOLY CARP

 

[Banastre]

Common glitch. Happened to me the other day.

 

[TheJohan]

I think that happens when you play the vanilla maps

 

[Stin]

That's weird, it doesn't happen to me.

 

[Venitius]

I believe it happens on a few maps.

 

[findecanno]

anyone know why? Nobody else seemed to have the trouble.