Not sure if this is a bug or can be controlled by some preference setting.
When matching to a specified MusicBainz album Jaikoz seems to added all the musicians into the Artist field.
For example matching to the Album Eve by The Alan Parsons Project, the Artist field is being set to the following:
“Eric Woolfson, David Paton, Stuart Elliott, Ian Bairnson, Duncan Mackay, Chris Rainbow, The Alan Parsons Project, Orchestra of the Munich Chamber Opera, Andrew Powell”
I would expect it be be The Alan Parsons Project and not contain all the musicians that appeared on the track.