I'm sorry if this is a duplicate. This happened when I tried to input Japanese sound file together with --print-colors flag

But the problem doesn't persist when I don't use the flag

I believe this is not an encoding issue with Windows since I activated the system-wide UTF-8 feature

It's interesting that the garbled characters are only some of the Kanji but the Hiragana ones are not affected.
Whisper.cpp version is the latest git commit c76c11e