The same symptoms were already brought up in Thank you for reviewing 20 close votes today!, but it was written off then as a one-time weirdness. This time, I request to fix this once and for all.
The message in Review Dashboard near a queue that I cannot review more until the next day - "Thank you for reviewing N <review type> votes today; come back in X hours to continue reviewing." - doesn't always reflect the actual number of items that I personally had been stopped at. Judging by the linked question, it instead reflects some current limit on the queue or something (doesn't really matter).
This discrepancy causes the message to be plain wrong and thus confusing at times1 which very much looks like a bug. The text should either reflect the truth or omit the number altogether.
1More specifically, this appears to be happening when queue length fluctuates around some threshold value.