Assuming you are using veraworks...
Are you insuring there are no transparency's in your art?
That is usually the most common reason the cut line doesnt show up.
I would think a tech would have all ready told you this though.
There is also a way to tell versaworks to cut more then 1 time, you could have accidentally saved that as the default in the settings which would cause it to cut 2 or more times.