Maybe you've found the resolution to this, but I just started using Reaper and had the same issue.
The horizontal zooming center defaults to being the playhead cursor. So if you've scrolled past the playhead, and then zoom, as I often do, the timeline jerks back to the playhead location.
I fixed this in Preferences > Editing Behavior by changing Horizontal zoom center to "Mouse cursor." Problem solved!
I hope this helps you and/or others.
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