Unless you can see the tuning machine spinning, I'd loosen the string, take it out of the pinhole and check the winding.
The most likely reason for this is the ball winding coming undone, or the ball hooked on the bottom of pin, or it being pinched between the string groove in bridge and the pin.
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Silly Moustache,
Just an old Limey acoustic guitarist, Dobrolist, mandolier and singer.
I'm here to try to help and advise and I offer one to one lessons/meetings/mentoring via Zoom!
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