Why does my guinea pig rub his nose in his bedding?

My guinea pig keeps rubbing his nose in his bedding and I dont know why. He does it mostly when I scoop his cage. I use blue Carefresh bedding.-Than

My guinea pig keeps rubbing his nose in his bedding and I don't know why. He does it mostly when I scoop his cage. I use blue Carefresh bedding.
-Thanks

or:My guinea pig keeps rubbing his nose in his bedding and I don't know why. He does it mostly when I scoop his cage. I use blue Carefresh bedding.-Thanks

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