Our users have occasionally reported film sections with some single frames that on scanning have jumped vertically that later had to be manually repositioned in an edit. It is not always reproducable when re-scanned.
I got to see some today and it looks like that in this case the film printing process has a printed illuminated window between the sprockets to let some edge data through. The window position is a little unstable. We imagine that the horizontal black / white window edges seem to confuse the stabiliser as a shifted sprocket hole edge on some frames. Disable the Y stability and the downwards jump effect goes away.
I enclose a couple of off screen images including a split image: a pair of adjacent frames produced by a simple x position shift of one layer using the same clip showing the vertical offset at a jump.
Some control that can modify its behavior on such material would have been be useful as we now have 50 minutes of content to correct for jumping.
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Cintel scanner 2 running v4 drivers, desktop video 11.5.1, resolve 17.2.0 on Windows 10 via thunderbolt