I have created a staff skills survey using the Canvas Quiz tool. I them made my own custom grading scheme to assign a 'Tier' to a particular score from the quiz.
The tier shows up fine in the gradebook.

But when I come to export the gradebook it reverts back to a number:

Surely this should not be the case?
I am not sure if I need to turn something on/select an option, but the last thing I want to have to do is recreate the gradebook again..
Any help gratefully received, even if it is to tell me that this is what I should be expecting...
Thanks