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Duplicated "SharePoint 2013" folders are displaying in K2 Management > Categories > Workflow > Steps. The same behavior can be seen in K2 Designer > All Items > Workflow > Steps.
Running the K2 Five Setup Manager under Configure options, will add an extra SharePoint 2013 Category under Workflow > Steps.
This is a known issue
with K2 Five and it will be fixed in the K2 Five 5.1 release.