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Is there a method of finding outif you have changed anything?If you haven't already, I'd suggest uninstalling SuperSU.
Secondly, are you sure you haven't done anything that would cause this (i.e. bootloader unlock)?
How do you flash stock rom?If you used a one-tap root application, then you may not have been affected by it's failure, unless you stopped it in an unsafe way.
If your device did get somewhat modified, then the only way to remove it at this point would be to flash your stock rom, unfortunately.
Go here: http://www.technobezz.com/flash-stock-rom-via-odin-samsung-galaxy-s5/How do you flash stock rom?
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You will need a PC for this method, however.