Hi Manila,
Its strange. but you did not say in wich source your booking for WBT course? i mean its directly from backend system ot from learning portal?
Standard workflow will be triggered for the standard delivery method.I can give you a technical solution to identify which workflow geting tiggered at the time WBT course booking.
you have to put the trace on using T- Code"SWELS once you activate the this do the booking.
and again check the event trace via T-code SWEL.
this will give you the information which workflow trigering for you booking, and also it will give you the detail log if the workflow with the events/objects and the containers.
going into step by step, you can identify for what reason this work flow geting triger.
this is quite technical thing better if you approch one of your ABAP'er or workflow consultant to identify this issue.
Regards,
Dinesh