Bump map issue

[giftheck]

So for my mod, I decided to modify the stock "Kashyyyk: Docks" map so that it has an MTT and AT-RTs as well as a few more world objects.

Pretty much every object on the map is now dark when playing. I have figured out that the issue is down to bump mapping on these objects as when I turn bump mapping off the issue disappears. However, the issue isn't present on the stock map. As far as I'm aware, I have copied everything over correctly from the stock folder though there are some object replacements though this occurs with objects and textures I haven't replaced as well. Any idea what's causing the issue?

Hidden/Spoiler:

[Marth8880]

I wouldn't be surprised if those assets utilize vertex lighting, which bump mapping likely disabled. I'm not very familiar with these assets though so I'm not positive.