ILS and Runways

Top of the day to all...Just a question to satisfy my observation. There are two airports in question (MBJ in Jamaica and the airport in Bermuda) i notice when the glide slope and localizer is showing that you are all lined up on the indicator the aircraft is way to the left of the runway in montegobay and far to the right in Bermuda. Is it ok to asume that all ILS approch dont uasualy lined up center with the runway? or is it something that i need to do. any help please.