Soraka ultimate with (almost) no cooldown?

Hello I play soraka quite often and lately I've been noticing a bug where after I ult it resets it;s cooldown with no reason. It only happend twice and I have no idea how that happens, anyone else who knows more about this? Ill try to keep an eye out coz this bug can be gamechanging. Ohw and yes I can use my ulty twice with the same effect. I also have no Idea if the cooldown resets instantly coz I've been focusing on the game.
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