Creepers float above the ground, see the image below.
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Gabe it has nothing to do with lag. Try it yourself and see. Get down to ground level and see they are floating two pixels above the ground.
The Creepers are walking always as they were walking on a layer of snow, whereas other mobs are sinking in the snow and thus walking normally on non-snow-covered blocks.
@unknown, this is MC-54120
Ive played and no creepers have done that. I would guess that this bug is due to lag.