My Nokia Lumia 635 keeps going out of certain apps?

I've had a Nokia Lumia 635 phone for just over 3 weeks and I'm already having a problem with it. Since 2 hours ago, when I go on the following apps:

-Google app
-Twitter app
-Facebook app… It seems to take me out of the apps straight away automatically. If you have no idea what I'm saying, basically when I go into Google, Facebook or Twitter, it takes me to the home screen like 1 second after clicking on the app's logo. I have no clue why it's doing this.

I have a couple of friends that have the same phone as me and they never experienced this with their phones before.

Why is my phone taking me to the home screen when I click on these apps?

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