USB ports act deffirently with my headphones?

[FAHMI BASSEM]

I use MS lifechat for listening and Skyping, just connect it to the VAIO and start using it, that what I thought, actually only my middle port does this (I used this port first with the headphones), but when connect to other port, it won't be ready, I've to change audio settings.

I'm wondering if this is an issue? or this is normal?

thanks in advanced...