There's a citizen in this fort, who did NOT arrive in the migrant wave of the 21st of Hematite, 128, yet her profile says that she did. Dwarf Therapist seems to agree. I don't know when she did arrive, however.

The dwarf in question is Adil Estunadil, "Boundwalled", Marksdwarf. She has been in the fort for enough time to have a significant amount of thoughts, as well as a large amount of experience from military training, which is simply not possible if she arrived this recently. Furthermore, she has been assigned to a squad, but I didn't assign any dwarves from that migrant wave to any squad.