Alright so on Call Of Duty Ghosts I was already in a clan and i saw an invite and I didnt leave my former clan before joining the new one and now on the Call of Duty app it says I am in both clans but on the game it says I am not in any clan
This is what you need to do so you won't have future issues.
1- Have your clan leader kick you from the current clan from the APP ( iOS or Android )
2- One you are kicked, because of a glitch in the system, it will revert you back to clan you first created. Go back to the APP ( you might have to refresh it a few times ) and leave your clan.
3- At this point, check your profile, your profile should not be associated with any clan. Now have the leader invite you.