Javascript - Isotope - Form - Back problem.

So i made this website. It has a search function on the home page. It takes you to a result page wich has a list of hotels with Isotope filtering And you can go to a detail page. You'll need to fix 2 things for me: 1. On the Isotope page, the search fields do not show the fields that are selected from the homepage. 2. When you are on the detailpage, and i click the Back-button i get an error only after refreshing the page i'm back at the results page. I made a video for you to understand the problem, please watch this first: [login to view URL] So first i select Badhofgastein and Kerstmis on the home page, but after pressing Search, you see the dropdown lists do not have that value. Second, after clicking on 'Hotel St Georg' and then clicking the back button you get an error and you'll need to refresh before you are back at the actual page.