iMovie duplicating audio and video

I'm trying to import PhotoBooth movies into iMovie. I'm choosing the "import movies" file in iMovie, and finding the videos from "pictures" "photobooth," and they seem to upload fine. But when they're done uploading and I try to play them some of the clips have no sound, and some of them have duplicate audio (audio from another clip, but not the one that's supposed to be playing). iMovie is also importing duplicates of my clips. I've opened all my videos in QuickTime as well, and they work fine there. I can't figure out what I'm doing wrong or if it's a glitch with iMovie. Please help me if you've had a similar problem! I appreciate it.