home page format totally changed- help!

Hi, I’m having a really weird issue! The last couple of times I’ve landed on my homepage, it looks totally different than it’s supposed to, as if I wasn’t even using this theme- the header, menu, and layout of the page all appear different. I took a screenshot and uploaded it, and the URL is below. How do I fix this issue? I want to make sure others who visit my page aren’t seeing the messed-up version. Please help!!

http://www.atwi80dates.com/wp-content/uploads/2017/03/atwi80d.png