Wrong gasket.
I thought that last night too. But it looked right.
So I just went out and checked. The gasket is right and the diaphragm is right.
wait for it.......................
But I did find the cause for it. The diaphragm was double punched on its locating tab holes. Elongating them.
So when it was installed at factory or if someone rebuilt it before it was off if you didnt pay attention to it closely.
The one that came out was black rubberish style. The one in the kit I installed was the tan fiberish one. Only one in kit.