The Smart-ID app only asks for confirmation for authentication/signing requests if you have more than one active Smart-ID account.
If you registered Smart-ID account and then;
- deleted the Smart-ID app from your device without deleting an account;
- later downloaded the app again and registered another Smart-ID account.
then you do have at least two active Smart-ID accounts. You should delete the account(s) you don’t use. Log into the Smart-ID portal and delete all excessive accounts.
If you have installed the Smart-ID app and registered an account on multiple devices, then all of those devices will receive notifications during the Smart-ID authentication/signing requests. You only need to accept the request on one of the devices, you can ignore all other requests.*
* As an iOS user you should clear the notifications as well.