QB Issue Resolution:

First, you’ll have to undo all reconciliations up to and include the one causing the problem.  (Be sure to make a backup first!)

If the difference between the statement and your balance is divisible by 9, the problem is often that you transposed numbers somewhere.

You might try reading this article.

https://community.intuit.com/articles/1764556-fix-reconciliation-discrepancies

Resolution for Issue 'how do I correct reconciliations back to July 2nd 2018' available: Yes (Solved).
Source: Intuit Community forum.

how do I correct reconciliations back to July 2nd 2018: 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.

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