Hm, I’m having the same problem, I don’t know if it’s always been like this as I only downloaded the plugin last week and noticed the error about 3 days ago.
It will say I have stats for tomorrow..when tomorrow hasn’t yet arrived! It also says my stats are working at UTC+3 which is not my timezone.
I tried rechecking what time I have my blog set at and it’s fine..not sure how to fix this one. Any info would be much appreciated!