Wondering if it might be due to this?:
“The mainspring barrel has a ratchet device to prevent it unwinding every time you release the pressure on the crown. That comprises a larger toothed ratchet wheel (attached to the barrel) and a click (a detente that locks the ratchet wheel) and a click spring (that acts on the click to keep it active). The click is what makes the noise as it allows the teeth of the ratchet wheel to pass in one direction and locks it when it tries to unwind. Again this will vary from watch model to watch model and isn’t an indication of a fault or poor QC, it’s just how it is on this particular model.
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