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odd stop motion/flickering geometry


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hello new to this forum and houdini, looking for some insight into some strange artifacts I'm seeing in a recent karma render of a simple vellum solve cache.

the cache looks smooth enough and the UV's look alright post cache but it seems no matter what I do I end up with what looks like stop motion or jittering in my final render. 

I've eliminated the following possible offenders from my guesses at offending variables:

davinci playback (working fine with other renders from same houdini project) 

timescale within vellum solver set to default and also slowed to .25
substeps within solver set to everything between 1 and 10

sub divisions within cache both divided and not divided
no cache at all pre final render
different materials on render
simplified collision geometry

can anyone help me identify the issue in the attached mp4? I'm sure I must be overlooking something quite straightforward

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