What is causing this banding when using my flash with my 16mm lens?

What is causing this banding when using my flash with my 16mm lens? Hello, so I consistently have this problem when using my Canon EL-100 speedlite with my RF 16mm f2.8 lens. When using it with my other lenses, I get normal coverage. I understand my lens is wide and I'll get vignetting on the sides because the flash doesn't reach end to end—but it doesn't explain the banding I get in the places where it does hit...

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