It would only bend where your arrow points if you had it sitting too high, and I suspect that's what happened. It probably rode up a little as you tightened the long bolt that holds the bracket in place. Then, as you torqued the equalizer bar, the bracket bent itself into position on the frame member where it wants to be.
Take it off. Inspect to make sure it didn't crack. Bend it straight. Put it back, and snug it to the frame member this time. Tighten it up. Inspect to ensure that it didn't creep up. The curbside bracket creeps up, the driver's side snugs down as you tighten the bolt that holds them in place.