They automatically update if the ward/branch has not adjusted them manually. For example, if classes were combined for some reason, the automatic update is turned off (for those only as I understand). You can reset them so they automatically update again (sorry, I no longer have access to look it up in LCR to give you step-by-step instructions).
Be advised that resetting them resets the entire ward - if you have other classes that you want to remain modified, print them before you reset so you can see how to modify them back again afterwards.