QB Issue Resolution:

As Safari818 said, go to File > open Previous company > Set number of previous companies, Change this to 1, then only the file that is open will show on that list. If you need more to show, you can change that setting later.

Resolution for Issue 'Delete duplicated Company Files.' available: Yes (Solved).
Source: Intuit Community forum.

Delete duplicated Company Files.: 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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