Omega 565 not fully winding

I recently received Omega watch using 565 movement. When I try to fully wind it at around 30 turns it does not turn stiffer but instead sounds like it would release some of the mainsprings tension.

I went through several posts but could not find a similar issue. Is this normal behavior for this caliber or is there some part which holds the mainspring broken?

I would estimate that the watch runs for about 30 hours and seems to keep time within 30 second tolerance per day.