the pronunciation has a distinctive q at the end which can be confusing as Tlhlnganpu' should end in a spitted vowel instead of a throaty q as in the audio.
Could you tell whether it was the male or female voice? I've listened to them both and they are both glottal stops. Part of the problem may be that the qay and the qaghwI' are both plosives articulated in the throat. They are made very close to each other and it can sometimes be difficult to distinguish them.
both have the q (soft kh sound) at the end when i made the test. that´s why it´s confusing as it should end in a powerful U (oo). I don´t think the audio was garbled as in other audios the strong and dry U at the end is easily recognizable. hope it helps.
Can you be more specific about what confuses you?
Also, are you reading the tips and notes that come with the various units? On the website, they "hide" behind the lightbulb icon on the little window that appears when you have selected a unit:
If you're using a mobile app, I recommend that you switch to using the website instead, because the app doesn't provide access to the tips and notes for most users.
If, after reading the tips and notes, you're still confused, please do comment with what in particular you have problems with, or which piece of the tips and notes is missing or confusing.