FSR-XC-Expert Question on Problem

hay guys i have a new 09 fsr xc expert and every so often i do a complete clean down.

i had the bike upside down on it's back today taking my chain off to clean. when i put it back on and started turning the peddles to make the tire turn i saw that the cassette it the back had a slight wobble in it.

and if i stop peddling and the tire keep spinning i see the the cogs in the bak wobble like when your rim is not true. is this normal maybe this could cause my back brake problem that makes noise. or do you thing i have a bent axel?

thanks
Jason