If you have multiple languages for your instance and edit a label (sys_documentation record) on the CMDB table, it overwrites all of the other languages on the child tables with that language.
Steps to Reproduce
Install the I18N: Internationalization plugin and at least one language.
Navigate to System Localization > Field Labels.
Set the filter [table] [starts with] [cmdb] AND [element] [is] [assignment_group].
You can use any field that is on the base CMDB table and has translations for itself and at least one child table. If they are not on the child table, you might need to view a record in that child table in another language.
Edit the Label field on the CMDB table for the English language.
Refresh the list.
Note that all of the child tables are updated, but the other language records also get updated and changed to English, making it look like duplicate records are created.
This issue is under investigation. For a temporary fix, contact Customer Support and reference PRB1248973.
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Related Problem: PRB1248973