Accessories Move During Simulation

Hello, 

I have a manufacturing process with three phases: Turning 10, Turning 20, Milling 30. When I simulate from the manufacturing program, everything goes well for all three phases. When I simulate a single operation (or a group of operations) or after editing an operation, accessories and tools change positions or appear (see photos). Is this a known issue? Or is this a bad approach on my part?

Simulation after editing an opération
 Simulation after editing an opération (ph20)

 

Simulation from the manufacturing program     (ph20)

 

 

 

 

 

 

Simulation after editing an opération (ph30)

 

 

 

 

 

 

Simulation from the manufacturing program   (ph30)