Sorry, maybe "ti" should sound like that, but I can clearly hear "ki". Especially in slow motion it sounds like "K". The same task has not yet been encountered, but as far as I remember, there is also a male voice.
Found the same problem in https://www.duolingo.com/skill/cs/Plural/1
Task: Type what you hear
Answer: Jsou ti lidé mladí?
Meaning: Are those people young?