Pogo Slots

The challenge says to earn 7000 coins from Free Spins in 4 weeks.  I have now played two days and got free spins three times.  The first time I earned 1076 coins, the second time I earned 247 coins and the third time I earned 234 coins.  The cumulative total is 1,557 coins, yet the total on the challenge shows no coins earned.  I have cleared my cache, which is done automatically when I exit the system and I did it now again.  It continues to show no coins earned from free spins.