Whenever I double-tap on the home button on my iphone, it doesn't let me close apps?

Usually you just double-tap the home button, the app windows come up, and you can swipe them up to close them, right? I'm not sure what happened but nothing happens when I do this now. Also I don't know if this has anything to do with it, but imessage is kind of screwed up too, because whenever I try to type something, the text box covers up the latest text. So if you know what's going on, please tell me what I need to do to fix this, Thanks!

Try turning the phone off for a couple of minutes and then restarting it. If that doesn't help, take it to an apple store. The button might be worn out.

I have an IPhone 7Plus and when I double click my apps that I want to close do not always appear. How can I fix this

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