QB Issue Resolution:

Somebody must be changing something in a prior quarter. To see, you can run the audit trail report to show activity after the end of the quarter (date entered/modified) and filter for transaction dates during the quarter. In the future you can lock the quarter after it’s done in Preferences/Accounting.

Resolution for Issue 'After reconciling and recording our P & L statements for each quarter, why would they change even though we haven’t gone back and adjusted anything?' available: Yes (Solved).
Source: Intuit Community forum.

After reconciling and recording our P & L statements for each quarter, why would they change even though we haven’t gone back and adjusted anything?: 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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