Really basic this, I'm sure, but I can't figure it out.
I'm sing FCP 6 and when I add chapter markers to one particular sequence, and when I move the playhead back to any of the previously inserted chapter markers, the right-hand side of the green marker is red. This doesn't happen in any of the other sequences I have made. Can't find anything in the literature ('though I'm sure it must be there) - what does it actually mean? Don't want to go ahead and use the sequence if it might be some kind of warning. Please see image below.