This isn't really a bug, but it is an inconsistency:

If entries in the Personal Table are created during an import, they appear as First Name in "Forenames" - any additional initials in "Initials" and Surname in "Surname"

HOWEVER, if the entries in the personal table are sorted by Surname, they are actually sorted by Surname+Initials - suggesting Initials should include the FULL Initials, i.e. people with no middle initial come before those with a middle initial irrespective of their first name.

I had assumed "Initials" should be the full initials, so now I have a mixture of styles, some of which can be sorted others are more difficult

Craig