Hmm, since "a while" (guess it came around or at the upgrade to 5.1) I suffer from a similar issue:
When I scroll via mouse/touchpad, the document (e.g. a spreadsheet) jumps around wildly, back and forth, as if the transformation from touchpad-gesture-scroll-movement to actual document movement would be far too sensitive. This happens especially when I scroll (i.e. move the fingers on the touchpad) very slow. I just tried it with -gtk3 removed and -gtk installed, but then soffice goes to 100% CPU when I start scrolling by touchpad and it take extremely long till it moves for a bit. Cheers, Chris.
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