Why did my iPhone 6 allow me to download an app that was already installed?

I've been thinking someone might have hacked into my phone but haven't been able to find any kind of actual proof, until now. My iPhone 6 let me install textfree which was already installed to begin with. Why?

Very doubtful that would be a sign of hacked equipment. It's more likely you either downloaded a) similarly named software or b) a software update or c) you never had the program you thought you did installed.

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