Do you mean 2014 D&D products? I don't think Crawford or Perkins have or had much to do with how big a print run was or how often books are reprinted.
If this is more than a local issue, I would assume that either the print run was smaller or that, for some reason, WotC hasn't been as quick to reprint it as they would have been normally. Maybe the natural time to reprint it was when they were rerouting all their resources to printing the 2024 core books, which famously used a lot more bandwidth than most books do.
Now that those are out in the wild, Saltmarsh may be in line for a reprint. Although, that said, if I'm right and WotC is going to start updating 2014 books for 2024 (and getting a nice little sales bump on them), it may get put on hold if it's one of the books intended to get the treatment.