It does not happen for every woman so I did some checking and it appears to be for woman who have got devorced. In this case it appears MyHeritage assumes the woman is now using her maiden name which is not correct unless she changes her name back legally. FTB shows the correct married name for these woman.
I made a mistake when inviting two of my brothers. Used wrong emailadress once and now one of my brothers are showing up with wrong name but right image in members page. Have tried to remove the person showing up incorrectly and the invite him again, but the error is the same.