Possible causes: two subscriptions on two different Google accounts; a pending authorization hold that later drops off; or a duplicate posted by your bank in error.
Check Google Play → your profile → Payments & subscriptions → Subscriptions on each Google account you use, and cancel any duplicate.
For a duplicate Google Play charge, request a refund through Google (see How do I request a refund?).
Still stuck? Email support@searchscout.app with the charge dates/amounts and your Google Play order numbers.