Well, I’ve just solved it …
Explaining it to someone else make me found out ( Rubber duck debugging … )
The only difference for placed actors are that every timers start at the exact same time when the game launch so…
My issue was all my timers beeing rightly exaclty in sync actually … so has evey steps were running at the exact same time for all actors, the code was interposing itself everywhere…
I solved it adding a random time a the begining before timer start, to asynchronise them.
I don’t know how you guys are handling it and if I used the right methode ?