Does anyone understand how Rakuten calculates the amount of the check that they send. It always seems to be less than my account balance, but I can't figure out what the cut-off is for what they include. My next check is due to be sent 5/15. Other than a reward I earned off of a purchase today, all other rewards were earned in early April or sooner, yet the amount that the site says my check will be is almost $30 lower than my balance prior to today's purchase.