Creating job categories problem

When creating job categories, it automatically generates the recent added category as xxxxx-2 regardless of the name given to the slug by me and the plugin is insanely enough to replicating another new category named "General" on every single new creating.
For example, I created a new job category name "Designers" and gaves slug name "designers", your plugins automatically generated a new category named "General" with the slug name of "designers" after I hit "Add New Job Categories" button and then assigned my created slug name as "designers-2" which in a result of me having 2 categories on a single creation.
How odd? I am looking to hear the solution or what caused?