New cresty question...

[noname]

I just got my first Crested Gecko at the TARAS show last weekend. It's a beautiful juvinile female (we're 90% certain of the sex), and is currently living in the same tank as my boyfriend's Cresty (we're also 90% sure his is female). Anyways, my gecko seems to be having trouble climbing. She can't seem to climb the walls of the rubbermade. She'll try, and just slide down...very strange. My boyfriend's gecko has no problem climbing at all. I'm just wondering if this is any cause for concern, or if anyone has reasoning behind it? Thanks so much guys.