I thought the rule was "e" at the end if it is plural? Is this an exception given "grå" is shown as a correct solution?
Both "gråe" and "grå" are correct. For some reason, probably the akwardness of the combination "åe", "grå" is also a permitted plural form of "grå". "Gråe" is also correct, so if you do not want to remember the exception, you do not have to.
True. I wrote "gråe" and it was accepted.
This problem shows both the "e" ending and the no "e" ending as correct solutions, but still counts the "e" ending answer as wrong.
I just used gråe and it worked fine