I don't see either not pre-washing/rinsing the rice (although I always do) or storage conditions of the rice making a difference. All the white basmati and white jasmine rice I normally buy - packaged for the south and east asian markets respectively which collectively number in the hundreds of thousands where I am - are not hermetically sealed unless I buy small packages sold for the "western" market.

Only thing I can is the rice having been previously heated, perhaps used for a weight when baking pie crust.