Might have something to do with this:
"China's Dagong rating agency, which several hours ago just downgraded the US from A to A-, maintaining its negative outlook. The agency said that while a default has been averted by a last minute agreement in Congress, the fundamental situation of debt growth outpacing fiscal income and GDP remains unchanged. "Hence the government is still approaching the verge of default crisis, a situation that cannot be substantially alleviated in the foreseeable future."