No it's not normal. The snake should be able to pass it's wastes, whether that's feces, urates or urine without soaking. It may be that your snake wasn't as well cared for as it should have been prior to your owning it so it's body isn't in top shape quite yet. It may be that you need to make sure it's getting the right size food, enough to drink and a bit more exercise so it can get it's insides moving along better. Just keep an eye on the situation and if the snake continues to have problems passing it's wastes, then I'd suggest a visit to the vet or a reassessment of it's husbandry to try and find out what's causing the backup.