I notice keeping flesh 91's kinkeshi in a tight seal bag for a long period of time. They become slightly oily and start to become yellowish in small parts. The yellowing can easily be rinse off with water.
yeah, my '91 figs in their bags seem slightly oily to the touch also.
I've had mine bagged for years with no effects. Do you guys smoke by chance? Or maybe it is a humidity thing? I know SoCal is more humid than NorCal.