Hey there, Djelmer.
Let me take over and help you with deleting multiple transactions in your register via QuickBooks Desktop.
The steps provided by my colleague Mark_R above are for transactions still in the Bank Feeds Center. Since the transactions are added in your register already, manually deleting them is the only available option.
You may find this article helpful: https://quickbooks.intuit.com/community/Help-Articles/Remove-duplicate-transactions/m-p/203298.
Should you need more help in deleting these transactions, please let me know. Have a good one.
