Teleprompter view starts vibrating/glitching when manually scrolling backwards

Hi! I ran into an issue while using Textream for recording a video.

While the teleprompter was running, I occasionally needed to go back a couple of sentences because I was speaking faster than the current scroll position. When I manually scrolled backwards on the Dynamic Island teleprompter, the UI sometimes started rapidly moving/vibrating between positions instead of staying where I scrolled.

I saw a similar issue reported around manual scrolling with Word Tracking enabled, but in my case Word Tracking was not enabled.

I was able to reproduce this in both:

* Voice Activated mode
* Classic mode

Expected behavior

When manually scrolling backwards, the teleprompter should temporarily stay at the position I scroll to and continue smoothly from there.

Actual behavior

After scrolling backwards, the teleprompter sometimes seems to fight against the manual scroll position, causing the text/view to rapidly jump back and forth or “vibrate”.

How to reproduce

1. Open a longer script.
2. Start the teleprompter in either Voice Activated or Classic mode.
3. Let the script progress for a while.
4. Manually scroll backwards by a few sentences on the Dynamic Island.
5. In some cases, the view starts rapidly jumping/vibrating between positions.

It seems like the automatic scrolling/positioning and manual scrolling might both be trying to control the scroll position at the same time.

Environment

* MacBook Pro M5
* macOS 26.5.2
* Word Tracking: disabled
* Reproduced in Voice Activated and Classic modes

Start at the Dynamic Island teleprompter's manual-scroll handling in Voice Activated and Classic modes, then trace how automatic positioning resumes after a backward gesture. Reproduce with a long script and Word Tracking disabled; done when the manually selected position remains stable and scrolling continues smoothly without jumps.

Written by the indexing model from the issue text.