should be easy fix?

Independent are considered a separate faction then the two main ones. They are not actually independent of each individual but rather just independent of the two main factions.

Its just that it is not very satisfactory to play as independent when you always get negative score.
On the server I usually play, I have tried to play as independent recently to balance the teams better (teams can be very off balance), but its not really tempting with how the scores work.

Thank you for your attention and reply

I assume you are playing the user created mission called wasteland? I don't know about wastelands rules regarding whether or not the independent side is free for all but normally the independent side is thought of as it's own faction similar to Blufor and Opfor. You loose points because you are in the games view shooting your teammates.

More to you point about "score", just ignore score. Score does not matter in Arma, there is no levelling up or persistent score unless the mission has that added in by a mission maker via mods or scripts. I'd assume your "kill count" would be what you could watch through your session but it still isn't saved or anything.