Citrus Muffin 柑香鬆餅

I like desserts that are made from banana and orange. This week i tried to make this... Citrus Muffin. However, the result is not what i expected. It is not soft enough. I guess i have to figure out what i have done wrong during the process. The best way is to try and make it again one day.
Source of recipe:
http://shirleyliving.mysinablog.com/index.php?op=ViewArticle&articleId=2215237

The ingredients:


Preparing to be baked


Citrus Muffin