Audio duration incorrect on imported YouTube video

I posted a similar post, asking for help in this matter, but so far no one has responded. I attempted to correct the text that was imported with my video (32 minutes long) and when I wanted to save and open it, it returned as an error - because my video vas indicated as being twice as long. It did not save my corrections either. Took me 4 hours to correct the German story. On top of everything, after importing the first video, the button for the sound (on the right side) that can be used to hear pronunciation of one word stopped working completely - for all my languages and in both old and new view. Is there anyone who could help me fix this?