Final Cut adding frames after out point?!

i posted this in the "mac applications" forum, but this might be a better place for this type of question...

i've been editing a sequence in final cut pro and in the viewer i set my in and out points and drag it down to the timeline. when i do this, final cut is adding about 10-15 frames to the end of where i set my out point. does anyone know why this is happening and how to turn it off? i've used fcp before and i'd swear i didn't have this issue before.

edit:
i played around with it some more and while i could not figure out why fcp is doing this, i found that the number of frames that are being added to my out points seems to vary sometimes up to about 2 seconds, or 60 frames. could this have to do with some sort of snapping? i tried turning it off, but fcp would still add frames after my out point.

any help would so greatly appreciated!

anyone?

they are mpeg2 (.m2v) files

you're right, that's exactly what my problem was. i followed this guide:

http://blog.mindbites.com/ripping-dvd-to-edit-in-final-cut-pro-for-mac/

and it solved all my problems. thanks so much for the help!