QB Issue Resolution:

You can see everything that happened in the audit log. Put in the 10/31/18 date and ending balance and reconcile October again, it should quickly turn green and you should be able to hit done and move on with reconciling 11/30/18. Someone must have selected “undo” to the prior reconciliation. You can find this in the audit log.

Resolution for Issue 'How can I correct a prior reconciliation without redoing it?' available: Yes (Solved).
Source: Intuit Community forum.

How can I correct a prior reconciliation without redoing it?: 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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