Frame overlapping on other videos

Hey,

I've had an annoying problem for a while now that I can't seem to fix. I'm attaching some photos to help you understand the issue.

To put it simply, the images from one rush appear on top of the next, even though I have the next one selected. This totally destroys my workflow.

Let me stop you right there: no, I don't work with rushes of different frequencies. The whole thing is 29.97 FPS 4K - SLOG2.

Yes, I've already tried changing the parameters of my sequence, which are the right ones. Does't help switching from 29,97 to 30.

Hope someone can fix this, and no need to tell me to downgrade because that's what I'll do if nothing can fix this.

Thanks,