YOu might find in many cases that they do not !! and that is how it is in the Real World.
Asobo had “incorrectl;y” forced alignent of all ILS’s in mSFS, with their runway heading.
In the recent #3 update, the corrected that error, and now IL:S’s heading are what they should be in the Real World, with many slightly offset from the runway heading.
You may have got use tom expecting ALL ILS’s to be perfectly aligned with their runways, and now find they are not anymore that way in the updated sim,.
Welcome to a more REALISTIC MSFS !!!