Use the Track Select Tool (A) and hold down Shift as you click after the end of your last good clip; then hit Delete. If there are any small bits of errant footage, they'll be selected and deleted.
If that doesn't work, lasso all your clips from the end of the sequence backward, copy them, and paste into a new sequence. It's possible that the sequence has just gotten messed up.
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Welcome to the forum.
As Colin surmises, you have some "orphans" out beyond where you think the Timeline should end. It could be just one frame from a Clip.
This ARTICLE will give you more background, but it was written for PrElements and earlier versions of PrPro, so be sure to follow Colin's instructions above.
Thanks for both of your comments.
I deleted 2 hidden clips (they were not shown on the Timeline but if you click on it they shows as grey bars), got everything back to normal now. Worked like a charm
Great news, and I just added Colin's instructions to that linked article (was not sure if I could do it, before you saw it), as he simplifies the process in newer versions of PrPro.