Warp Stabilizer resets itself?

Warp is perhaps the heaviest effect for hardware demands and complexity short of say Neat color noise removal. Just is.

And all the analyzation data is stored as that ... metadata. Which can get corrupted if on i or o gets flipped.

In my experience, once you have a clip analyzed and looking good, the next step is to do a full render and replace to a good codec, such as ProRes 422. Get that Warp outta there.

As yes, what you're getting can happen. I like to get each step done so it can't bite my backside later on. Saves headaches. Screaming at the monitor. And unhappy clients.

Being the practical person I am.

Delete the Media Cache and Media Cache files:
https://community.adobe.com/t5/premiere-pro/faq-how-to-clear-your-media-cache-in-30-seconds-in-premiere-pro-2020/m-p/11017257/thread-id/260446?page=1

If that doesn't work, try resetting the preferences:
https://community.adobe.com/t5/premiere-pro/faq-how-to-reset-trash-preferences-in-premiere-pro/td-p/8236158?page=1

If that doesn't work, try resetting the Workspaces:
Reset a workspace
Reset the current workspace to return to its original, saved layout of panels.
1. Do one of the following:
• Click the Workspace menu icon and select Reset to Saved Layout.
• Choose Window > Workspace > Reset to Saved Layout.
from here:
https://helpx.adobe.com/premiere-pro/using/workspaces.html

If that doesn't work, try Preferences > Audio Hardware and set Input to None.

If that doesn’t work, try updating or rolling back your graphics driver directly from the video card manufacturer’s site. If NVIDIA, do a clean installation of the latest Studio Driver (NOT the Game Driver).

If that doesn't work, try creating a new project and import the old one into it.