Im Jan 12 NOA1 and agree that WAC skips weeks. Everyone that is jan 20 or later is receiving NOA2. After looking at info from apps and online it is clear that WAC skips weeks, all visa types , not only K1 are skipped between Jan 4 and Jan 19. I think tour week got skipped as well. Its hard to fathom how this happens. Perhaps our case were given to the slowest employee or they have other complicated cases to complete?