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It is most likely that you have an "Orphan" out beyond where you think the Timeline ends.
First, I would hit the \ (Backslash key) to zoom out on the Timeline, then hit the End key, to go to the end of the Timeline. Do you go beyond where you think you should? If so, there is an Orphan out there. Select it, and Delete.
Expand the Timeline with the -+ slider above the Timeline. Make sure that the slider is all the way to the right so that you are at maximum expansion. Then, as Hunt suggested, hit the End key and inspect the area where the Timeline Indicator stops. These possible fragments/leftovers present typically as very thin vertical black lines scattered in the tracks. After you delete any such fragments, repeat the process to make sure you have all the fragments.
The major reason for me adding to this thread was to remind you never to put a stop marker at the end of the last item on the Timeline. It is a bad practice to fall into. It is not needed and creates all sorts of problems especially as seen in burn to disc.
Please let us know the outcome.