No Experience

So, what the title says, I sometimes just don't gain any experience. Here's what happened:

1st Game of the Day: First time I've played in a month. Update, Draft pick, Jinx, lose, gain xp 2nd Game of the Day: Ranked Duo, Taric A+, win, gain xp 3rd Game of the Day: Ranked Duo, Taric B, win, gain xp, I qualify for promotions 4th Game of the Day: Draft again, Blitz B+, win, nothing???

I can't think of any reason to suddenly stop gaining xp and it's bothering me because i'm 250 away from a level up