Position y-axis doesn't keep it's value when combined with scale

If that's not it, delete the keyframes and the reapply them.

If that doesn't work, 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 NVIDIA graphics, make sure to use a Studio Driver from NVIDIA (NOT the Game Driver), but not the latest version - it has issues with Premiere Pro.

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

Expand the timeline visible in the Effects control panel to see if there is another keyframe hiding.