RAM Frame Lateral Load Distribution

I've read the portion of the RAM Frame manual that talks about how lateral loads are distributed for the different diaphragm types, however, I'm currently analyzing a model for which I can't make sense of the way the RAM-calculated wind loads are being distributed. 

The building is a 7-story structure. When I initially ran the model with all diaphragms as semi-rigid. My understanding is this does an analysis that, in the end, is a "hybrid" between distributing lateral loads based on tributary and wall stiffness, dependent on the rigidity of the diaphragm. I didn't like the results I was getting as semi-rigid, so I changed all diaphragms to rigid. It is my understanding that now, all loads should be distributed based on stiffness. 

See the screenshot below. I have two identical walls pictured with the exception of an opening in the bottom level of one wall. The one on the left takes ~15k while the one on the right, with an opening, takes ~37k. I can't think of a reason that the one with the opening would be taking more load than the one without, and by a significant margin. 

Thanks in advance.