You are on the triads (3 notes) page. The ear trainer deals with the 4 types of triad found in the major plus harmonic minor scales: Major, minor, diminished, and augmented. The augmented is a triad that is found in the harmonic minor scale.
If you are new to ear training, or just have questions about it, you should direct your questions to the IMusiK.ca Music Theory Chatbot. This artificial intelligence chatbot will be able to answer most of your questions. In fact, it was created specifically to work in conjunction with the IMusiK.ca Ear Trainer.
This free online ear trainer also has pages for Intervals (2 notes) and 7th Chords (4 notes).
If you like the ear trainer, or have suggestions for new features, or just comments in general, please feel free to contact me.