This can be caused by declaring workflow in two configurations as follows:

1) If the HR record producer has an HR Template with a value in workflow assignment, it will trigger the workflow assigned to the HR template. Sample below

HR Record Producer template:

HR Template:

2) Once submitted, if the HR record also satisfies a workflow because of the workflow conditions, it will trigger the second workflow. 

You can go to Workflow Versions > Filter the HR table name in the Table column

Sample condition configuration:

This will cause duplicate workflows attached

Modify or remove either configurations

1) Workflow assignment on the HR template, or

2) Workflow conditions