Yes, I noticed this also. Several things changed last week (between August 28 and 29, 2019). I think they were trying to improve some of the headers in the notification messages, but they accidentally changed the From so that when viewed in the Fastmail web or mobile app interfaces the message appears to be from "Fastmail.FM Administrator", which has not been used for the past 5 years (when Fastmail moved to the fastmail.com domain).
I just sent a note about this to Fastmail staff I know, and I will let you know how they respond.
Bill
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