@Michelle
That is a very strange occurrence. Since I know you always do a "good" waiver, my only comment is
-its a mistake
or
-was the 5 year waiver a bit too generous? Could someone now have said "you shouldn't have gotten 5 years right away?"
The only times I have seen this, is when people reapply and do a really crappy job. For example, the personal letter sucks or they omit things like a drug test despite having narcotics conviction.
In the personal letter I always put "I appreciate the last 5 year waiver you gave me" mainly to remind them that "hey....this is a reapplication".
All that being said, it could simply be a mistake. An annoying one.