Hey ,
Yeah okay that’s what I was suspecting and also fearing 
I solved issue as you explained. I did a bit of script in controller to manage a click system and communicate,through Blueprint Interface, with any actor Player clicked on.
While it’s working pretty good, I’m still wondering why OnClick event wasn’t looking for “anything that clicked on it” like overlap does.
Ps : Shouldn’t this event have tiny screen icon that ‘cosmetic’ events usually have? Or at least a small note so it won’t confuse newcomers.