My ASC notice has only I821D under the application notice and I was confused/concerned about this.
I called USCIS and inquired about this, I was told by the representative that my notice was for I765 even though it says I821D, I asked her to explain this, which she explained as being that I765 is the application that requires background checks, not the I821D, that did confuse me and I guess I annoyed her with my "ignorance" because she began to sound annoyed...
Oh, well. My applications were sent to Nebraska and like Jose pointed out earlier, some service centers work differently. My ASC notice only had 1 application but if others have the same "situation" or concern about their notices, its nothing to worry about...