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It's difficult to tell without slowmotion, but I think there are probably some sort of waves and resonance in the chain's motion. Simply by that, with enough slack, the drivers could repeatedly jump out of the groove (at least, partially) and go back in. A slight lateral movement of the bar or...

Actually, a saw chain is always pulled throw the kerf, either with the bottom or the top of the bar. Really pushing the chain wouldn't work at all in a matter of cutting, it's like wanting to push a rope.

Aside of all that, I see a point in favor of the "it seems" : When you are bucking on the ground, you automatically slows down to avoid going throw and burying the chain in the dirt. But when you finish the cut upward with the log up side down, there is nothing to worry. So you cut with no...