Website issue or Inspiron issue...Not so sure

I went to this website called "Nepal Trekking" as I was exploring things to do in Nepal while travelling. I don't know much about website as I am not a geeky person. But this website is not loading properly. I don't think it's the Inspiron's issue as it is one of the best model.. I am just asking. That website is: . While surfing, AirBnB too, I sometimes feel same issue. The website link is:  Umm..