Unroot to stock ROM without stock kernel? - Android Q&A, Help & Troubleshooting

Hi!
I have unrooted my phone to stock samsung galaxy s5 ROM (Touchwiz). I thought that everything would be as if the phone was brand new, but I suspect that my kernel isn't stock samsung, since tv2 sumo app that uses kernel detection says my phone is rooted. (I have no root access now...)
Is it possible to have stock android ROM but not stock kernel? How can I get stock kernel?

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