Inconsistent Lighting Data Between PCs

Whenever I build lighting on one PC (“Computer A”) and open the level on another PC ("Computer “B”) the lightmap is completely destroyed. I’ve forced overwriting of the level and .BuildData files but cannot seem to resolve the problem. I cannot figure out what exactly is occurring to cause the inconsistencies between PCs.

The problem is exemplified on the wall behind the chairs. The image on the left (“Computer A”) displays correctly. (Computer A is also the computer where the lighting was originally built) Computer B’s results are completely blown destroyed.