That’s actually similar to my issue with my carbon steel.  There’s a sizable patch where the seasoning simply won’t stay put.  It’s immediately obvious.
Wten initially seasoned, it became a beautiful bronze color. But after the first couple of uses, a patch peeled right off, returning to its original steely silver.
Repeated seasonings have gotten it a shade or two darker, but nowhere near the rest of the pan, nor even the color of the original layer. And it isn’t just a visible difference- that patch is nowhere as slick as it should be.
				
			Wten initially seasoned, it became a beautiful bronze color. But after the first couple of uses, a patch peeled right off, returning to its original steely silver.
Repeated seasonings have gotten it a shade or two darker, but nowhere near the rest of the pan, nor even the color of the original layer. And it isn’t just a visible difference- that patch is nowhere as slick as it should be.