Seems like your camber is off. (alighnment)

Im going to say that you tires are pretty low profile (50series)
I have 40 series on my car and when I go over bumps my car gets kinda loose. Its just the tires, they may be overfilled or there low.

Also lower profile tires seem to follow cracks in the roads. When the road gets uneven in my car the car seems to ride over to where the road goes.
Like say the road is being worked on and the road gets lower in/near the middle. If I go over that little lump my car will pull to that area and then straighten out.

Does that make sense. Also jack up your car and check for loose bolts. Swap bars, struts, even the rims