Its just a young dog thing imho........it thinks it can find more than you can show it.
Keep showing it stuff on the lamp, make sure the runs are as easy as you can make them, dont be giving it silly impossible slips............pick and chose, if you dont get the right slip then dont slip at all, just go home.
Its just my very uneducated opinion, but the dog needs to learn that it only "wins" with you, so keep the stuff easy while he is young........a young dog is just that, young!
Thats my 2 penneth, others will know much better than me.