Creasted gecko not sticking

My created gecko is about 2 years old or so and he's not sticking to the glass he sticks to everything else just not the glass. I'm thinking he might be in shed.

He might be going into shed. If he is, increase the humidity in the viv, and wait until he sheds. If he is a slightly paler color, generally on his tummy, or his toe pads, or even on the tip of his tail (if he has one) then he might be going into shed. My male cant stick to the glass to save his life! However my female can practically climb up anything. Its all on the gecko. And dont worry about him not sticking properly- Crested geckos dont have glass in the wild!