HELP - Why isn't my kernel changing?

As the title says, why isn't my kernel changing?

I'm currently on Galaxy S7 (G930F) with Oreo-rom and TGP-Kernel, TWRP 3.2.1-1

When I try to flash another kernel, for instance Notorious Kernel or my own modified boot.img, the install is successful in TWRP, but when I look in settings it still says "TGP Kernel bla bla bla...".

Why is this happening, and how can I make my new kernel "stick"?

Any help is appreciated, thanks!

EDIT: I even made a custom cooked rom with a modified boot.img (both stock based), format data and made an advanced wipe including everything except OTG & SD.
AND TGP IS STILL PRESENT?!

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