HISTORY DELETES ITSELF ON IPHONE

So, my mom was messing around on my phone and now the history keeps deleting by itself! It's very annoying because I have to sign into my accounts again and again, and it never saves the password. Also, the two blue lines on the top and bottom of the screen turned black (i don't know what they're called, but even if that helps. I'm technologically impaired).So please help! Give me instructions?

Time to go see the nerd herd at apple.

Go see the nearest Apple Store near you.
This is strange.

Hope this helped!

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