QuickBooks only accepts information from the bank.  Since your bank changed their platform, this could be the reason why the payee name is incorrect. I’d suggest contacting your bank’s support to get help in sorting this out.

Resolution for 'banks support issue: 'When I download transactions, specifically a deposit, a specific payee name, not related to the deposit, is entered into the payee field where it has always been left blank in the past.' available: Yes.

The banks support 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 banks support issue yourself by looking for a resolution described in the article. If it is a complex banks support issue or you are unable to solve the issue, you may contact us by clicking here or by using other banks support support options.

For more information about resolving issues related to banks support in Quickbooks/QBO or to get support for the issue 'When I download transactions, specifically a deposit, a specific payee name, not related to the deposit, is entered into the payee field where it has always been left blank in the past.', click the link below: