Why do tops of my hemispheres and spheres get chopped off?

I made many attempts to create hemispheres and only managed to get one perfect. All others get holes in the top. How can I prevent the hole?
Screenshot 2021-06-08 at 7.16.45 pm

What’s the radius of the circles you are using? I expect you are working on very small radii and running into the tiny face issue. You can work at a larger scale of use the Dave Method to avoid it.

Hemisphere

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Thank you very much. That is the solution. I was using radii of 7mm.

That’ll do it. The thing in my GIF has a 6mm radius.