Run LiveUpdate

i have been noticing that my liveupdate is not working properly. the liveupdate does run every now and then or it appears to have run. however, i have recently noticed that when i click run liveupdate and it runs its course that it finds updates ranging from 1-4 updates that have not been installed. if the liveupdate did run then why does it still need to be installed? it appears that the automatic liveupdates is not running properly or installing updates but instead requires manual clicking of run liveupdate. let me know if you require additional information.