Is it fine that a doll swings on a string?

Its a ~20cm high, light doll, which hangs on a string. It slightly (with an amplitude of 5mm or so) swings on the string. Windows and doors are closed

It's a ~20cm high, light doll, which hangs on a string. It slightly (with an amplitude of 5mm or so) swings on the string. Windows and doors are closed, so it's not wind/air masses. When sitting or lying it doesn't move, or I just didn't see it moving. Is it fine that it's moving, or is it paranormal?

or:It's a ~20cm high, light doll, which hangs on a string. It slightly (with an amplitude of 5mm or so) swings on the string. Windows and doors are closed, so it's not wind/air masses. When sitting or lying it doesn't move, or I just didn't see it moving. Is it fine that it's moving, or is it paranormal?

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