Back softkey changed functionality

I have an Lg G2 running Cloudy G2(4.4.2). Phone was working fine until 2 days ago. Now the "back" soft key does not work like it used to in many apps. For example:

Chrome
Before: back key took you to the previous web page
Now: takes you to the main home screen with all my apps, but if I then go back into chrome and the hit the back key it will go the the previous web page

Reddit is fun
Lets say I was in a post,
Before: would take me back out to my reddit home page
Now: takes you to the main home screen with all my apps, but if I then go back into reddit and the hit the back key it will go the the previous web page

Sharing a post from an app to another app(reddit to hangouts for example)
Before: when hitting share it would take you to the app in which to share the post. Then hitting back key would cycle through all the screens and you would end up back in the reddit post
Now: takes you to the main home screen with all my apps. Going back into the app doesn't work. You have to close the app

Hangouts
Before: If I was in a chat, hitting the back key took me back out the list of chats
Now : takes you to the main home screen with all my apps, but if I then go back into hangouts and the hit the back key it will go the the previous web page

What could have caused the back soft key functionality to change like that?

Thanks,

Craig