I've just started to learn guitar and I'm having some strange stuff happening. I'm doing an finger/string exercise that goes like so:

1st finger / 5th fret / 6th string
3rd finger / 7th fret / 5th string
4th finger / 7th fret / 4th string

and so on... anyhow I notice that as I'm stretching my hand (only been a week, so there's not much dexterity there) the last note I sounded buzzes a little. I think it's because I move the last finger I planted ever so slightly as I reach for the next note.

Could this cause the last note to buzz? Is there any way to fix that or should I just try not to move the last finger as much as possible?