content appears in edit page mode but not in view mode

Hi, I am having trouble adding content to existing pages (the main page container with classes: .container.animationStart is not displaying when we edit the page, even with scrolling down/up the page). The text looks fine in the edit page mode however when you update and select view mode it disappears and am left with a blank page (navigation and footer remains). I have tried viewing on different computers and browsers. It works on PC using Chrome and on iPad using Safari but not on mac using Firefox or Safari.
I would be grateful for any assistance.Thank you.