when i mist my tanlk they do the same thing partly slide and some times fall off but then again when they dart across the tank after the crickets they do sometimes hit the glass with there heads they do things some times that make you think can they redally be that dumb but that is just the way they are.
i have 3 whites one is blue like yours and she is the out going one and a total pig, the other 2 are green but one spends so much time on the cork board at the back it normally stays pretty brown she is the quiet one, dosent eat as easily as the other 2 and the one who stays mainly on the glass hiding inthe fake vine leafs he is just slightly weird he dosent do alot but every now and then croaks whilst im on the phone, he eats alot but the blue one is the greedy one. if the green and blue are out first then the brown dosent get much of a look in when it comes to food but she is now learning to fight her corner.
after a while you will see each does there own thing. then you can kind of work out there patterns how they feed, where they sleep it just takes time and watching. i got mine in to a routine i mist them late at night on the days im going to feed them and this does help with observing them.