At the beginning of a period--whether it be a week, month, or quarter--the stats for that period go back to zero, because they applied to the previous period, which has just ended. This is probably the only reasonable way those stats could be displayed, but I've found it confusing as well, because when one week, month, or quarter is considered to end is sort of an arbitrary cultural fact.
As terdon said:
This month and this week simply means today since it's the first of the month and a Monday. You've gotten 41 points today and Rinzwind's gotten 20. Everything seems fine.
Note also that you observed this on the first day of July, which is the beginning of the third quarter of the year. So all three periods happened to have restarted anew at that time.
As you mentioned, the month shown there is not a rolling month, even though the concept of a rolling period of is intuitive and often useful. This is analogous, and similarly confusing, to the distinction between the English phrases "within the hour" and "within an hour."