Yes is normal.

After your hit six paths for the first time you become part of the actual season circuit and your rank resets to school ninja student and 0 points at the end of every month giving you rewards linked to the rank you reached in the previous month.

You have 14 days to claim the mail with the points gathered from the previous season. Personally speaking i suggest you to wait 10-12 days and to claim it after you reach 47-48 points so that you are instantly six paths again by avoiding the hardest part of the climbing (the whole super kage rank).