"Morgan, dych chi'n hoffi coffi?"
Translation:Morgan, do you like coffee?
This is just an artefact of the 'text to speech' synthesis probably generated by the contracted 'dych chi' at the beginning.
The Ivona voices are still around on the web, here is the latest incarnation:- http://www.readspeaker.com/
The full sentence for the above 'Ydych chi'n hoffi coffi' gives the correct pronunciation for coffi.
Just to clarify - this current live version of the course is complete and cannot be modified except in limited fashion, as its structure and range of vocabulary is fixed. We do recognise the repetitive nature of some sections.
The new version of the course has an extended and rather more flexible vocabulary, and it has a new structure in many areas. Unfortunately we do not know the timetable for its introduction by Duo - we are waiting for more information.