Can someone explain why i have a 15 minute dodge timer when I haven't dodged in two months?

I almost never dodge, I figure there's usually no point but I realized i was in aram and it also gave me a champion I don't like so lik... I wanted to do my 5 minutes and get into something else.

99% of players do this, it's always just 5 minutes, once per day you get a dodge.... so why is it that the first time int wo months I got a 15 minute wait. It just seems inconsistent

I always had 5 minute cooldowns before, did something change? I'm not mad just confused