I’ll probably run into this issue soon too in that case. I found that I need to put a little tension on the bolts in my middle section to get proper contact with the rails. Definitely not hand tight, so that’ll probably pull mine out of square. I’m on the IE version btw but I’m assuming the issue will be the same either way?
Do you think you’ll have much work to do in the fix of the current part? Would it be easier/less time consuming to just fix the new style part and move over to that instead?