Can anyone help?

We have become aware of the fact that the emails for course bookings have started to be sent from individual members of staff, rather than the admin email address. I have checked our settings and the admin email address is in the correct place.

 The response from Totara is; 

With regard to notifications coming directly from those who made a booking or cancellation, this is expected behaviour. There are some system/automated notifications that will appear from the sender address in the global Face-to-face settings, but a booking or cancellation made by a particular user, will appear as sent from the user's email address.

However, I know that in the very recent past the emails were sent from the admin address, not from individual members of staff, so can't quite work out what might have changed or how I can get this changed back.  It is cause us some issues as at least one of our members of staff works in more than one department of trust.

Anyone any ideas?  Or have the same problems and would like Totara to change this urgently?

Rita