Glad there are others frustrated with the female voice. And what happens sometimes, just like with this lesson, is if you answer está that could correct. To the best of your ability you’re answering it right, but you’re still marked wrong. Adding insult injury, if you’re using the app, you will lose a heart for no good reason.
In Spanish the "Gerundio" is actually our "present participle". It can be confusing because our word "Gerund" is used only for the present participle when it is used as a noun. In the present progressive tense in English, we use the present participle with a conjugated form of the verb "to be", but we use it more often as we like to report what we are doing as we are doing it and even use it for the future with a word that indicates when. In Spanish, they cannot use the Present progressive for future at all for it is like saying "I am in the middle of doing this." http://spanish.about.com/od/progressive-tenses/a/present-progressive-tense.htm