Front page went missing

Hello,

Haven’t been on word press too long but I just don’t understand why this happened at all. I was trying to add social media icon to my header on http://www.comcoreinc.com and added a bit of code to the CSS on the editor to turn a menu item into a photo. It didn’t work, but everything was fine. I then removed the “instagram” link on my menu for the header. still seemed ok. Literally went to lunch, came back and now my background photo from the home page is missing, a grey text box for, the spacing is gone and my links are stacked instead side by side. Anyone have any idea why this would happen!?!?

Could really use some help, even in my pages editor the rows and visual editor arent even there to edit but there is still text on my homepage!

Im also missing a map on my contact page from Contact forms 7. why why why? It seems I lost access to my back end pages editor on word press admin somehow. Content still show up on my page but I cant edit it on word press?

Any help much appreciated!!