difference in the pitch and speed

[shawnchiao]

When replay the recorded speech, it would be lower in the pitch or (when I use headphone, it would higher and resultin like Donald duck sound).
I have no idea why it would be like this, I compare using webAPI to record and replay the same sound (pronounce by myself with same headphone), webAPI is normal.
Anyone experience the same issue?

[everythinginjs]

1+