Ok so after digging into it a bit more what is actually happening is that the regions are not able to overlap.
Usually the main region sits on top of the over all pre-box region but what is happening is that first the pre-box is loading to the left to avoid the main region and then when the dock occurs the pre-box says "well I need to get to the right of you and pushes the main region to the right because they are refusing to occupy the same space.
Note again that this only occurs on the front page, all of the other pages do not show this behavior.
I would re-title this post:
"region-pre-box area region-pre-box shifting on dock and pushing mainbox away"
if i could.