QB Issue Resolution:

As long as the transactions were not deleted they will show in the next reconcile.

Resolution for Issue 'Ending balance changed after last reconciliation resulting in an incorrect beginning balance for April 2015' available: Yes (Solved).
Source: Intuit Community forum.

Ending balance changed after last reconciliation resulting in an incorrect beginning balance for April 2015: 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.

Support for Balance
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Error Recovery for Balance [Canada]
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