Export Problems, Please help

I was working on an animation in 12 fps with audio, but when I exported it as a movie the fps skyrocketed and now no longer syncs with the audio. How do I fix this?

make sure your export movie options are 12 fps, make sure you have enough frames to go along with the sound file, also if you export a SWF file with audio it can cause problems

I exported it with the 12 fps movie setting but it was still too fast. why is this happening? I worked on it in 12 fps with the audio, but when exported as a movie it changes and when I set it to 12 fps in settings it still comes out to fast.