Miss calculations of lightmaps

Hello All.

I seem to be having some issues with light-maps that I can't seem to figure out.

I have multiple point lights built into a room that are mapped to modeled light fixtures (used as Prefabs as to keep them the same through-out the scene). Some of these Prefabs are working fine. However, as shown in the image below, some are causing an issue on the textures making them too bright (to the point of being white).

The light meshes do have a self-illumination on the white are but I didn't think that this would cause such an issue.

The thing that seems strange to me is that we have two rows of lights. The left hand side row has no issue, but the right hand side does. Are there any ideas what could be causing this and how it can be solved?