Welcome , JCCova. Yep, this is the type of experience that a lot of us are having with our apps since upgrading to iOS 7. For me, it's most frustrating with an app called Photo Manager Pro where I do a lot of my work on a typical day. When I switch back to do it after working somewhere else, the photo I was looking at is gone and the app has reset back to its display of initial root folders. Another big problem for me is Wikibot which loses the Wikipedia article I had been looking at.
So many people are having this problem but I haven't seen it addressed in any of the iOS 7 reviews I've read. Apple doesn't seem to be addressing it. And then I guess there seem to be other people who have noticed it but are fine with it, which I don't really understand.
Makes me really appreciate my desktop PC running Windows which doesn't suffer from this ridiculous problem. Every app is exactly where you had previously left it when you switch back to it. I imagine the desktop and laptop Apple OS's also have good app-switching. This seems to be only a problem with Apple mobile devices running iOS 7 which doesn't have enough memory left over to do app-switching properly.
I wonder if this is an issue with mobile devices running Android.