Sounds like you had one that was reconciled and one that was not and you deleted the reconciled one?

Find the entry in the bank register and click it in the cleared column until you see “R”. That will re-reconcile it.  Disregard the warning box that tells you not to do […]

Resolution for 'column until issue: 'double journal entries – delete one entire journal. Need to replace new entry with old one that was reconciled' available: Yes.

The column until 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 column until issue yourself by looking for a resolution described in the article. If it is a complex column until issue or you are unable to solve the issue, you may contact us by clicking here or by using other column until support options.

For more information about resolving issues related to column until in Quickbooks/QBO or to get support for the issue 'double journal entries – delete one entire journal. Need to replace new entry with old one that was reconciled', click the link below: