Okay, there seems to be a bigger issue here. Members were imported with generic "Member/Moderator/Administrator" titles, and not the default titles assigned to them in Classic & Threads.
When I clear a member's Title, it remains blank, and does not get assigned the default titles I set up that should be assigned by post count.
I do see the CP option "Check this box if you want to update existing users with these new titles. (WARNING! Any custom titles will be overwritten by doing this.)" but assumed that titles would be brought over in the import...?
Bug?