I have an issue adjusting color correction on clips in attached storylines (not primary). 9/10 times FCPX will jump to the first clip in my project when I start manipulating the color board. See video below. I've had this problem for a few years and always update to the latest release. It has also happened on two different installations of FCPX (two different imacs).
Done. I think I've reported this to them before but not in the past year. I also have the problem when adjusting animation keyframes on a clip in a connected storyline...similar issue. Do you experience that as well? It's probably related.
This seems like such a big bug that they would have fixed it by now as it's been several years.