QB Issue Resolution:

“Reconcile” means to reconcile the book balance to the monthly bank statement balance, an exercise that is done once per month. Obviously if transactions are missing then the book balance is wrong, so you can’t reconcile it to the monthly bank statement.  When you say “after reconcile”, you must mean posting from Banking>For Review; that is called posting, not reconciling.

If transactions are missing then you can download a CSV file from your bank’s website for the missing date range,  and upload it into Banking>For Review

https://quickbooks.intuit.com/community/Banking-and-bank-feeds/How-to-upload-more-than-90-days-of-ba…

Resolution for Issue 'Quickbooks is missing (after reconcile) bank transactions between 6/1/18 and 10/15/18. I have tried all troubleshooting and need help.' available: Yes (Solved).
Source: Intuit Community forum.

Quickbooks is missing (after reconcile) bank transactions between 6/1/18 and 10/15/18. I have tried all troubleshooting and need help.: 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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