sheep pack a waste?

i downloaded 4 sheep packs and for some reason when the screensaver is up it repeats alot of the same ones over and over again.im very new to the program and love it,but very frustrating to see the same ones over and over.is there something i need to do to have them play.i just put them in the mpeg file in es sys32.

and also why are the sheep not flowing together smoothly?it does on a few but some it cuts to something totally different.any info would be fantastic.

i have win xp for os