ahh, okay, i see you are referring to the misson objectives feature of the benitomuso's minimap mod.
it'll be best for him to give you the exact info, but meanwhile i can say, depending on which version of the minimap mod that is, it was initially still a 'beta' feature, and wouldn't work properly.
i think it's since been fixed, have a look for his minimap mod thread, you might find some info there.
i'll find the link if you need, but i don't have the time right now.
meanwhile, best option is just not to use that specific feature. i'm guessing you're sitting with an earlier version, which was still a bit buggy.
edit: ok, here's a link to the minimap thread:
https://www.sas1946.com/main/index.php/topic,8327.0.htmli'm sure your problem is related to an earlier version, where that particular feature was not fully implemented yet.
you can always post in that thread and ask for help if you don't solve it yourself, benitomuso will gladly help you out.