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As Mike said it sounds like bad seeing and maybe a warm scope, how long did you have the scope out for before you looked at Jupiter?
a 12" dob will take a fair while to cool in our warmer months
I set my scope up around 5pm then I dont bother using it till around 7pm and being a SCT it takes longer to cool than the Dob's, by around 9pm the optics have cooled and the image's I see are better than at 7pm.
if the moon is close to the gas planets I find the image tends to wash out somewhat.
Try letting the scope cool for longer if you can.
cheers
David.
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