Wow-never seen anything like that-I didnt know they even could. If a large weight was applied I suppose each bar could bend incrementally-or holes walloed out, odd. Ours 13years dont do that, even a little, they are the single bar. Though recently changed over to the Torklift Glow steps, because we installed thier basment step, they are nice- with 8" treads. So I could reccomend those also. Actually could reccomend our originals but I dont know brand.
It might be possible to fix- stairs arent cheap but I think those are done. Someones gonna get hurt. Top bracket using the long side arms does look wrong.