Usually it's because you have different products, not because you've paid twice for the same thing. These are the most common reasons.
The app and your devices are billed separately. WeHunt Premium or a Tracker app subscription covers the WeHunt app only. Each device with a SIM card from us has its own Device SIM subscription, which isn't included in the app subscription. WeHunt GPS Max covers both the app and all your devices in a single subscription. You can see the status of each device under My Account → Products. Read more: Your current subscriptions and licenses in WeHunt
You have both a Tracker subscription and an older WeHunt subscription. Both work, but you're effectively paying twice. Log in at wehunt.app and go to My Account → Dashboard. If you can combine them, you'll see an offer there.
You've bought the same subscription twice, because the first one ended up on another account. See I've paid for a subscription, but the app still shows Free plan.
Note: Already have a Tracker app subscription? Then you don't need to do anything. It's valid in WeHunt too, and equivalent to a WeHunt Premium subscription.
None of these match? Contact us with the dates and amounts from your bank statement. We can see all your subscriptions and will help you sort it out if you've paid twice.