The Callback queue is routing back to the originating VCC Channel Number.
Virtual Contact Center (VCC) Callback Queue.
Add a GetValue object above the callback function to collect the desired callback number.
A callback IVR object cannot be used on its own. It has be used with GetValue object for the caller to manually enter the desired callback number.
Not utilizing the GetValue will cause VCC to use the caller ID of the caller. This can cause the system to intermittently insert the originating Channel Number as the callback number.