Keyframes bouncing back and forth despite interpolation being set to linear

I’ve spent the past few hours trying to troubleshoot an issue where my position keyframes keep bouncing back and forth on one specific slide, and I can’t pinpoint the cause. The issue is with the spotlight gradient composition moving from the first keyframe to the second. I’ve already confirmed that all keyframe interpolation is set to linear and checked for any hidden bezier handles that might be affecting the motion path. I've checked the main comp panel as well as the value graph. I’ve deleted and rebuilt the keyframes multiple times, restarted both the software and my computer, and even updated the program, but the problem persists. None of the other keyframes are doing this, so I’m completely stumped at this point—has anyone run into this before or know what might be causing it? Maybe I'm not looking closely enough? Let me know if there are more helpful images I can attach. Thanks!