Well, to your first quistion of is the Snake's behavior nomoral, Yes it is. Well we all have different Appatites, and all Corn Snakes have different appitites. I myself don't eat alot, but that doesen't make me abnormal.
Not to be Disrespectful in any way, or shape. But if you were a Corn Snake, And Your owner watched you eat, and the Snake beside you had a really good appatite, and you weren't hungary at the time... Well just think about that.
To Qustion number two, You could try giving the Snakes Fuzzies, if not, That's ok.