I think that everythig is okay, but they only forgot to change one line in build prop. So you can safely flash this update. No stress guys
Maybe going to Settings/Apps and disabling Paranoid OTA until next tuesdayi would guess, they just forgot to change thr version number in the build.prop.
if you feel annoyed about it, you can change it manually in /system/build.prop
but only guessing, as i am on PA 4.5