Membership PayPal transaction staying pending

We are currently using the free version of membership on a client site, we are going to change for the premium soon.

But in the actual transactions we have 2 pending that said
"Last transaction is pending. Reason: eCheck that has not cleared yet" our client said that she received the payment but the account of the users are still not linked to any subscriptions, the transaction always stay pending.

Does the plugin not supposed to handle that? So when we receive the payment of a pending transaction it get completed and link the subscription to the user?

thank you