Well, haven't seen that happen with a single character, but for two in a scene. To get rid of the problem, i'm always renaming the magnets (and dials) in the cr2 of the characters i'm using (as i'm usually using them for more than one scene). Of course that also means i have to create copies of the pose files and rename the names in there, too. (But that's just a matter of seconds replacing everything in a file/directory.)