All of my custom fields are gone. What happened?

We just noticed that all of our custom fields are gone.  The entire additional fields section has been wiped and reset.  Can you please investigate this and let us know what happened and how we get these back?
There are several factors that may have caused this to occur.  For this reason, please contact support and reference this article number. 

Steps to Duplicate

  1. Setup>Database Configuration
  2. Click Expand next to Additional Information
  3. Custom names in the Field column have been replaced with default field names (String #1, Boolean #1, Date #1,etc)

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