Delete incoming/outcoming edges from Object

Question

I have several classes:

• City (Vertex)
  
• Route (Vertex)
  
• has_route (Edge between City and Route).

When I deleted the "has_route" class from the Database, the City's records are still has empty values of deleted "has_route" class in "IN" and "OUT" fields.

This is very strange for me, cause I do not have the edge class in the database anymore, but I still can see it when I'm querying the data.
Screenshot of empty link on the data
What should I do to not seeing the deleted fields on my data?