Fix the position of the banners

Fixes bugs with the first position in parallax banners.

https://trello.com/c/Ctzkwi65/326-parralax-headers-and-weekly-photos-often-broken-in-safari
https://trello.com/c/TfAmgTAx/341-banner-in-interests-not-displaying-correctly-again


I only just noticed that the leaderboard changes the scroll position. Maybe we should change this so it's always open? that change is quite annoying