When submitting ticket, Technician randomly changes if the request is associated with a service group

When submitting ticket, Technician randomly changes if the request is associated with a service group

Whenever someone submits a ticket and designates a specific service group for the ticket, they can still assign whatever technician they want to. The problem is that, even if they select a technician, the system will automatically change the technician to someone else. I could be inputting a retroactive ticket for an issue I solved, but when I assign the ticket to myself -- it will enter the system as another technician. 

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