Bathroom smells of Hazelnut Biscuits

I am domestically challenged.  I washed and tumble dried the bathmat and towels together and now the bathroom smells of hazelnut biscuits.  I imagine the rubber in the mat went a bit funny although it looks fine.  The towels went in for another wash and are now fine  but the mat - well it continues to exude biscuit.

Anyone had any strange domestic mishaps? Would appreciate knowing I am not alone in my incompetence.