Could you please let me know the version of Lightroom you are working on ?
Also which part of the image do you touch to zoom, do you touch at the Center of the image or at the corner?
I assume it is the latest version CC2015.3.
Wherever I touch the image with 2 fingers to zoom, even if I try to hit dead center, it jumps, mostly to the right.
No trouble with only one finger.
Could you please check if you are in the Touch Workspace in Lightroom.
I am not, there is no dedicated touch workspace for the library module, is there?
When I activate the touch-option it directly jumps to the development module, where the pinch-zoom is still messed up.
I did work better before in either place.
Yes, resetting the preferences solved the problem. Zooming is still more jittery than in Photoshop, but no jumping off to the side anymore.
Sounds good, You are Welcome, Glad to help.