Strange: Today's exp do not match this week's exp on the leaderboard although it's Monday.
My daily overview and chart says I have collected 300 exp today. My leaderboard on the other hand says I have earned 257 exp this week. Since Monday is the first day of the Duolingo week, shouldn't these two numbers be the same?
I've the same problem, today I logged in on PC and my scoreboard score is some exercises behind my weekly score. Most of the times my scoreboard matches up my weekly, but I think some times it doesn't, and I've lost a couple of league promotions because of that. Some times, if I'm near promotion I do some exercises on just before Sunday's midnight, but It's worthless because of that lag.