Oke I found the problem and now i feel dumb because I wasted good hours on this, in blackboard the keys have an option called “Instance Synced” if that is checked it will sync with all the instance of the blackboard.Why in the world would you put that checked on default ? :))
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As far as i understand it the blackboard variables with “Instance synced” on can essentially be interpreted as static variables in C++, which means all actors that use instances of that blackboard share that variable and its value.