This bug has been afflicting many a class for some time now. It has to do with the fact that the target of the buff sometimes (but not always) shows as the caster on your maintained spells. It has something to do with how the buff affects both the target as well as the caster. A work around is to open up the character config xml and manually type in the casters name, then buff it manually. Or to turn it off, empty that line in the xml.