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Ahhh, I think I've been an idiot. It didn't occur to me that, because my first filter is incomplete, it's not being entirely deterministic (only the first few columns are being written). And then it further didn't occur to me that when I call GetFrame on it twice, it is actually getting the frame twice, and not caching or anything - on the first GetFrame it's coming back with one set of garbage data and on the second GetFrame it's coming back with different garbage data. That was the discrepancy I was seeing with the second filter.
So the first filter is faulty (due to being a work in progress) but the second filter could also be a bit smarter.
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