I've been having a strange issue in Mail ever since upgrading to Mojave. When I go into the archive of my Gmail I can't scroll down through a multiple email thread – it immediately 'bounces' me back up to the top, as though I'd just clicked on the thread again. I can only access messages in a thread by opening the dropdown list and manually clicking on each message.
It's hardly a debilitating glitch but its annoying. Has anyone else experienced this, or know how it might be fixed? I've done all the interim OS updates and nothing has changed.