See photo attached. Other side is fine. Do I need to replace? Or can I bend straight? If I push down it just lifts again shortly after.

Welcome! I have the same happening on mine, albeit just at one end. I just shove it down with my thumb - not exactly effective either so it will be interesting to see what others think.

I'd be tempted to put a small amount of something like tigerseal under them, push them back on and asking tape them in place until it sets - it worked wonders for the same issue on my old Civic.

Yes I have this  (MY2016) on the rear offside passenger door, thought it was just mine😃 

 

I just push it down but it soon lifts back up. I don't think it's even related to operation of the window either as they hardly ever get used. 

I guess it's pretty much a feature! I'll ask the dealer to check it when it goes in for it's last service before the end of the warranty - but otherwise, I can imagine trying to stick it down with something, albeit nothing to permanent just in case.