It may be the variety, hard to say. But the Russet Norkotah is a moister tasting Russet potato and can sometimes turn out a little wet when baked, instead of dry with a crumbly texture. Some people prefer this moist profile. The Russet Burbank bakes up pretty dry and fluffy. Once baked, return the scooped out mixture to a pan on the stove to cook out extra moisture and try adding the milk and butter hot and not over mixing. Below are a few recipes I suggest to try.