Do you have any idea why is it oval?
I need it to be like this
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I downloaded your file and I found 2 modifiers on the cylinder. For this you did not really need modifiers. If you still want to use a Subdivision Surface modifier then, in this case, you would use the Simple mode instead of the Catmull-Clark one. Not really sure what you wanted to achieve with the Displace modifier. It was easier to start with a new cylinder.
I deleted your old cylinder and did the following:
End result below.