What is going on with these once fired roll crimped Chedite hulls

[JD43]

 Fired in a.410 Stevens 301T
One on left is a Remington factory fold crimp. Looks normal to me.
Three on the right are handload Chedite hulls with a roll crimp. All melted and drawn in.
The white color is a camera problem and does not show outside the pictures. What I would to like to know is why the hull mouth is melted and drawn in like they are. The patterns are patchy and not too good.

[ShootingABN!]

May 410 Apex Ninja and Federal TSS are like that as well. Patterns are bad with mine as well. I'm hoping they will improve.

[gobblergls]

Roll crimped hulls in all gauges have deformed openings caused by  the high temps of the firing.  It doesn't affect patterns.