Can you please check whether workarea bar is 2:35 seconds in timeline or not?
Can you please also check whether workarea bar option is selected or not in You tube export screen?
How did you check for stray clips? Sometimes they're hard to see.
Press the \ key (above the Enter key on your keyboard). This will show your entire project's timeline. If your movie doesn't fill the screen, left and right, then you have stray frames out beyond the end of your movie.
Also, pgauda's point is a good one. Make sure your Work Area Bar is the same length as your movie.