Strange effect

I am working on a CD3 City, using the CD3 A Symbol Set as a starting point. I have added some basic house styles and each building has the Bevel effect.
When I aply the effects, some grey houses get a weird sort of pixalation in them, the orange colored houses are fine (they are a copy of the grey houses, but with another base color) and the dark grey building is a simple polygon I drew.

Altering the values of the Bevel effect don't change the weird layout and to make matters worse, some grey houses are fine (rectangle on the left).

Does anyone have any ideas what could possibly go wrong in this drawing?
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