A strange click while winding

Hi all,

I am still new to Omega, and the Grey Side of the Moon is my first Omega watch.

While winding the watch, after a number of turns, I hear a strange clicking sound, as if something is slipping inside the spring barrel. Apart from that, everything else works fine, and the time is accurate.

I’m just wondering if I may have done something wrong, or if this is normal for Omega watches.

The movement of this watch is the Co-Axial 9300 Automatic.

Thank you.