Could you record a video of CH showing this? A few seconds is all that is needed. Otherwise, if you can record a scene like this can you screenshot the timeline?
There are different possible reasons. E.g. if using the web cam but the lighting is not very good. Another reason is if you jump from one value to another (e.g. you have two adjacent takes without blending to transition) it can overeact. Seeing the timeline might give some hints here as to what is happening near the frame where the jump occurs.
If it is a single continuous recording.... Ummm.... well, let’s start with the above! Lol!