My iPhone suddenly went from having 9.4 gb of free space to 7.5 gb of free space?

I didn't download any apps or anything, or record any videos or take pictures. I didn't do anything, it just all of a sudden happened today. How can I fix it? I have a 16gb iPhone 5

Here the difference is in GB that means some data has been added to your phone's memory but you don't know but if you're sure then it must be bug due to which sometimes it shows wrong calculation of storage.

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