My Samsung Galaxy Note 5 has 515 dpi?

I checked most on-line sites about the Samsung Galaxy Note 5's specs and the dpi was at 518, I checked mine with the app called "CPU-Z" and it says that I have a Screen Density of 515. If I remembered correctly the last time I've checked it on the same app was at a 518 dpi. Did my pixels somehow died? Or is this just a minor glitch?

Stuff that I have been recently doing
Downloading a few ISO launchers and un-installing them straight after (Maybe this could be the cause?)
Restarting the phone to see if it is a glitch or not

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