Is there a problem with my Chinese X (study) visa?

Hi all, I hope you can help me with an issue I have with my Chinese X visa (the student visa for study). I'm studying abroad for an academic year in Chengdu, China. I applied for my visa at the consulate in Houston. On my application I indicated that my longest consecutive stay would be 140 days (as I hope to go home after the first semester for a break), and then I'd return for the next semester and stay for another 140 days. I got my visa back from the Chinese consulate, and while it is valid for a year, in the "Duration of each stay" category, my visa says "000 days after entry." I don't know if this is a typo, correct, or what, but it seems to me that it is incorrect if I need to stay 140 days and they've put "000" on my visa. I was wondering if anyone out there knew about visa stuff, as I'm kind of new at this, and could tell me if I need to go back to the consulate and get them to fix this, or if this is correct. I'd greatly appreciate any help!