Playing as Fane I was chatting to the spirit that gives you bless. While talking to the spirit i switched back to someone else in my party just to see what would happen. (it happen to be Sebille.)
I then finished that chat and was given the Bless spell. But only one person got it.. Sebille.
I reloaded, did the same thing with switching after i started talking to the spirit and the same thing. Only Sebille got Bless.
I reloaded again, didn't switch and now everyone has it.