Sites does not want to work, bugging

Hey there!

Im new in this thing and we have/had a working website. The only way we can reach now is this link https://www.novakecom.net/Home.html , every other link(without home.html, without https, without www) is the old one. We just ran into another problem, if we click anywhere in the site, we got send back to our old (you can see on the top left that snoopy is there, because we changed it later)

So overall, dont know what the issue is, i would love to get some help on this.