Problem with the final export.

Hello, I have made a video that is suppose to be 6 minutes and 53 seconds, but when I exported it to .mov file in my documents, only 6 minutes and 28 seconds was on that video. In the program it self there is a kind of "blacked" "cloaked" "shaded" area in the end of the video project. How can I extend this so I can get all of the video exported out as it should be?
Thank you for all answers. I also have a picture how it looks on the screen.

That's not a project. It looks like you've edited inside a clip by opening it into the timeline. What do the icons in the upper left of the timeline look like. You could try making a project and copying and pasting the contents into it.

I agree with Tom, and it may be a Compound Clip that was originally used in another Project timeline.

I have had many students make the mistake of opening a Compound from a Project timeline, only to forget they did that, and get lost with editing, missing media, etc. So that's one thing I think needs to be considered. I wish Apple made it much more clear visually what type of timeline one was editing in at the moment. It is easy to get them confused.