I'm new to blender and I just finished editing a video montage.
In the exported version I noticed that the audio is out of sync, but only for one or two of the clips I used. Every video clip I used has its own audio, so every pair of audio-video strips has exactly the same length.
I didn't notice any problem while editing, I have AV Sync on. My audio and video strips are grouped since the beginning. If I move one, I move both.
Has this ever happened to anybody? I have no idea what the problem is.