I have Tubus front and rear racks and they are both all over the place. I wasn't at all impressed when I bought them, the rear rack fittings were woeful too and went straight in the bin.

They have been reliable and served me well for 15 years or so but I do still cringe every time I notice how wonky they are.

I should put the heavier pannier on the side that sticks inwards to balance things up but never do of course.