兵士たちは武器を慎重に運びました。

English Translation

The soldiers carried their weapons with care.

Am I crazy, or does it sound like he is saying き instead of ぶき?

Hello @3mguri ,
A native Japanese speaker here!

I searched the sentence and listened to the Clozemaster original TTS in the new Fluency Fast Track Level 2. As you pointed out, the Clozemaster’s TTS improperly pronounces 武器 as KI instead of BUKI.

Also, the Clozemaster’s TTS doesn’t put an accent on 兵士 and sounds unnatural. You need to put the accent on the first syllable HE of heishi (兵士).

Google Translates’ TTS pronounces the Japanese sentence very naturally. Try comparing.