It looks like the post is not connected to the dolphin striker support. Look at where the post sits on top of the aluminum support for the striker--it looks like it is pushed back.

I have a few Nacra front crossbars and they are either 'welded' (screwed in from the bottom?) to the support or they have a plastic/ruberized metal piece that holds them in place.

I bet that when you are sailing that rod 'walks' off the support piece and that probaly lends to your post getting bent because it allows it to go through the beam at an angle. I would also try to figure out how to secure it so it has some support and actually does its job, which is to support the front beam.