QB Issue Resolution:

Yes, you can delete a duplicate transaction download from your bank. You’ll need to exclude the duplicate transaction first before you can delete it. From the Banking Transactions page, select the transaction you’re looking to exclude by placing a check mark right next to it. Click on the Batch actions button at the top left, and click Exclude Selected. The transaction will move to the Excluded tab. From here, you can delete the transaction by selecting it, clicking Batch actions, and clicking Delete.

Resolution for Issue 'How do I delete a transaction that has been downloaded twice from the bank feed?' available: Yes (Solved).
Source: Intuit Community forum.

How do I delete a transaction that has been downloaded twice from the bank feed?: this issue or error code is a known issue in Quickbooks Online (QBO) and/or Quickbooks. Support for this issue is available either by self-service or paid support options. Experts are available to resolve your Quickbooks issue to ensure minimal downtime and continue running your business. First try to resolve the issue yourself by looking for a resolution described below. If it is a complex issue or you are unable to solve the issue, you may contact us by clicking here or by using other support options.

Support for Bank Feed
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