In the first pic you will see I have a nested sequence with some markers on it. I want to delete these. I double click the nest to go inside it and they seem to have disappeared. How can I get rid of these?
You can select the nested sequence, then hold shift and drag the playhead to each marker individually, press M, and hit "delete". Might have to do it twice to get it to disappear on both the video and audio tracks. However to delete them all at once, I have no idea. I have a sequence with a lot of markers and I'm trying to delete them all, and can't seem to find a way. Since you seem to only have a few though hopefully that will help.
I know this is an old post, but figured I'd answer in case someone else comes along looking for the answer as I did. To remove markers from the audio/video file just double click the file and then in the source window right click and select clear all markers.