Any idea why some users personal history is half English and half Chinese?

Example:

Vincent Spence (2/16/2007 4:16:14 PM): hey
Eunice Olivo (2/16/2007 4:16:23 PM): t<
Vincent Spence (2/16/2007 4:16:31 PM): there are 3 online requests
pending
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Eunice Olivo (2/16/2007 4:16:47 PM): ৰȴ
Vincent Spence (2/16/2007 4:17:00 PM): you have to assign a manager