I must have put my lower bumpstops in backwards and I have been hearing a thump when going over small bumps. Finally checked it out today. Not sure what I was doing but I sure like it better now. Thought I'd share the photo. See how the lower rubber mount extend to far towards the rear and at flex contacts the rear track bar.

 

To me in the picture it looks like your track bar bracket bolt is hitting the bump stop i don't think you are bottoming out on the bump stop when you flex it may not hit it at all.thinking.

 

To OP. I see it. Good catch.

 

Yep... Wasn't hitting the bumpstop because the lower bumpstop was installed backwards and it was hitting the trackbar. Flipped it around and it's all good.

 

Exactly same thing happened to me, I almost pushed onto my break lines. My stupid dealers installed it