Check the parallax setting on the layer. Or this can be caused by the lens effect.
I can't access your link.
Sorry about that. Strange, because the link works even when not signed in. I'll just explain the example.
I used the example from howtoconstructdemos.com and added an event to create sprite at the center of the scope upon left click. The parallax is 100% x 100% on both layers. Looks like the lens effect scales the layer below from the center. Really nice example for a magnifying glass, but maybe not a scope?