set status to Accepted, assigned Cyprezz.
This is on purpose. In this case, it does seem broken. However, for jams that have tall banners which can be up to 2048px, imagine having to scroll past that on every sub page of the jam when you're trying to read about it, view entries, results, activity, etc. Soooo, on the homepage the banner is full height and all others where it's more likely the viewer is interested in the selected content, the banner is forced to a set height.
I admit it looks silly on the example jam.
Image changing on Jam profile, but not on othter jam pages