I understand what’s going on. With the 12h titan chest cooldown when you leave an alliance happening at the same time as a Nature Chest, but I doubt the devs are aware of that situation.
To make it clearer… I killed my 5th titan filling up my chest, then left my alliance, and proceed on opening my titan chest AFTER leaving. The next chest happened to be a rare one, but the cooldown took effect.
If I had opened my titan chest BEFORE leaving the alliance, everything would’ve been ok I guess. It’s good to know for everybody.