Usually, it is a date reason that they do not match.   The check is written in one month and it clears another.

Resolution for 'bank this issue: 'why are checks not matching when they are down loaded from the bank this started about 3 weeks ago making a 5 min process in to a 45 min process' available: Yes.

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

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