Tubular upper control arms Issue

It's hitting the tab on the caliper retaining plate, and that cut a groove. That's been going on for a long time.

That's why you have to check the full range of travel when installing aftermarket UCA's like that. Looks like bumpstop for the UCA wasn't hitting the UCA, or not soon enough. That's pretty common with most tubular UCA's, only the QA1's have a bumpstop incorporated into them. With the other style's you have to move or modify the bumpstop to keep the range of travel the same.

Looks like that UCA is cut almost all the way through. I suppose you could weld it up, but at this point I'd be concerned about the stress that cut has placed on the topside of the tube as well.