I got a Mayor Title (from sister settlements) on my account.
I claimed the title, but when I go to my profile, I still see my self as a Proprietor (was my previous pledge level).
(EP, IP Inventory are properly updated)
What you're calling your rank is just the highest package you've bought. Claiming the sister settlement makes you a mayor in game, but it doesn't upgrade your package, two different things. Hope this helps.