sounds like you accidently plundered an S

the plunder screen said ss(it was shining gold to) the reward was 50 coupons and when i won the match there was an orange box instead of a blue one floating the person head that i just plundered i tried to take a screenshot after i close the notification window but he disappeared . I never plundered for coins and i don't ever plan to because the coupons are obviously better.

Yes same thing happened to me a couple of days ago