Two Bugs:
In 100 most common (which I have mastered) I continue to get the same 10 sentences without variances when reviewing in sets of 10.
In 500 most common I am receiving half the amount of points for each level of mastery. e.g. 4 for 25% 4 for 50% 6 for 75% and 8 for 100%.
These bugs are occurring in both Android and PC. I have noticed it for two days.