On some of the member's page that have made changes to the profile customisation are seeing a post to timeline with a huge, and I mean very very very huge as in long page scroll, header. None of the other page blocks' headers are affected, just the post to timeline.
For now, I am going to see if a custom design block will fix it so that the profile customisation is not applied to it but it is strange that the other blocks using the same design box are not affected.