Sweet Jesus, thats not right. But I don't know Quick Seps. sorry to say. Wish I could help. Sounds like you might have an embedded color profile that is overriding your output getting.
Could this have been in CMYK color mode when you opened the art file? If so, All CMYK conversions will that persons computer color settings (typically default) embedded into the file. So converting to RGB won't help and opening it in Quickseps and running a CMYK conversion on it won't help either. Sure, you can still print them, but it may not come out like you expect.
I donno if this is your prob or not.