Borg building keeps changing geometry

System

On a ground map, I am using Borg Building - Small 01 #01, in which the pic of it is just a giant block, basically. Indeed, in the play test, I will get this, a big block of a building. Then, once in a while, I will play test, and a giant freakin' pyramid is resting on top of it. I'm like...wat? It will stay like that for a while until it decides to dissapear during another random play test.

Ne1 else experiencing this?