Thanks all of you for your ideas.
Dennis: yes the bolts to the cross member are in one of the photos. I can't see anything wrong with them.
Bent bracket, that's my thought too, but how can it be bent, it's flatter the other way. If the bracket has had an accident and become bent, it should be bent "sideways" not "up/downwise"
Big Hammer: The level is right.
JW: I don't understand