Single post in PokéDex errors

Found another one that I wanted to double check on - is Apocolyptic Arcanine supposed to be listed as a dual Fire Type? Mine just evolved and it's registered as Fire/Fire. It shows that way in my dex too. The other Apocolyptic lines are dual typed - but not repetitive. Poochyena is Dark/Ghost, Golett is Rock/Steel and so on so it kinda confused me XD