I think it depends on the 'ae' being short.
The grammarians should have established for a short vowel always to be followed by a double consonants (I think it is so in Swedish and Norwegian), but in Danish the undefined word comes with just a single consonant.
The audio seems te have changed for the worse! Normal speedvis way too fast and slow seems realy destorted. To learn a language like this is not very progressing. The system though is working, but more grammatical hints could be usefull!