Why business rules for entity are duplicated ?

Hi everybody

I have created 1 business rule for entity as shown under

But when i use Advanced Search  feature it return 4(!) activated the same business rules. Shown under

My code also returns a few instances.  

Why it happens ? can i just delete these odd business rules ?

I used

XrmServiceContext.WorkflowSet.Where(w => w.StateCode == WorkflowState.Activated && w.Name =="One TeamPro Project ID")