My iphone already has a response written out to my txt messages?

I have an iphone 5 and I received a simple txt message from a friend this morning saying, "where are you at?" When I opened the txt message the message bar had a responce written in it saying," home". I didn't even type anything? Does anyone know why there was already a response in there without me typing anything? Has anyone else had this problem?

Sometimes the messing goes weird once in awhile, if it happens with me i just to the restart thing (hold the home and power). Then after it loads it works fine, I do that couple times a week because my shortcuts don't want to work.

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