In addition to Silas' note, I was trying to reproduce the text browser behavior you described initially - on my Windows using Accordance 12.3 and could not duplicate the problem.
I must be generating the Text Browser differently than you do. Could you give me the steps you used to get to this Text Browser? Could you send me your workspace that includes this problematic Text Browser?
Orly, this "scroll glitch" (as I'll call it) is produced regardless of my Workspaces, or personal settings. I've reproduced it here for you in five different ways--one of which doesn't use any Workspace of mine, or user-imported versions of mine. Please see these newest 5 screenshots, especially the one titled "Orly."
You asked how I'm generating the Text Browser. In at least a couple of these screenshots, I'm simply going to "File" -> "New Tab" -> "Text Browser." I've done this for both "Hebrew Texts" (preset) and "Greek Texts" (preset), and in the latter, I have no user-created texts whatsoever. Yet, I still get the "scroll glitch" if I select more than 1 verse.