Okay. I saw your profile and I saw that you had unpublished your hubs. Have you republished them after doing the editings?? You have to click on "publish button" near the "done editing button". Click on the titles on "my account", if you see the content then you have to publish them.
Or the other thing can be you might have edited your hubs and erased the matter and then closed the windows (thinking that it's not saved so the changes you made will not occur). Once you remove the content while editing, it'll will be gone. There is no save button just the done editing button. I did the same once but that was a small part of my hub. Or you might have accidentally erased the things.
I would suggest that if you have a copy of those articles in your computer saved in MS word then delete the titles and republish the articles. And if not then from now-on-wards do keep a backup copy of your hubs.