Sims try to leave house through Window instead of door

I had a similar issue in San Myshuno, in the 64x64 park. The sims will not use the front door of the main building on the park. Instead after spawning 10mts away from the front door of the building (after the lot is loaded) they always go to either of the sides of the park (there are holes in the fences) and then walk towards the back door of the building.
Something similar happens when they are commanded to leave the lot. They go to the "holes" in the fences instead of choosing to go thorugh the shorter path (which requires them to get into the building and exit though the front door).While testing I tried closing the fences so the only way to get in/out the lot is though one side of it, but they still try to exit through the now closed sides, they find that they can't and so they go all the way around the building until they finally leave the lot. The front door of the building has no problem as I can force the sims to go through it,  they just seem to dislike the front door when moving autonomously