[Clayart] Hole in the bottom of a bowl on a potter's wheel

[Vlasova Tatiana]

Hello! Can I ask for advice for novice potter?
I make a bowl 28-30 cm, and when I remove it from the wheel, there are no
air bubbles, there is no hole at the bottom. But when the bowl dries, the
hole forms from the outside downwards in the center. Where the bottom
touched the wheel. Not cross-cutting
As if the clay in this place was more wet and sat down more.
When I cut the bottom, I removed this hole. But I do not understand why
this is happening?

many thanks
Tanya
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