Recently doing WeChat public development, no. Call the public interface to get the fans list, by the interface returns a list of the openid, there is also a next_openid, could you tell me which openid is sorted by what rules?

Public, developers said in the document, while the number of public followers number more than 10000, but by filling next_openid value, thus many times pull a list of ways to meet the demand, in particular, is in the call interface, will be the last call for the return of the next_openid value, as the next call in next_openid value, "but in the actual test, I found the latest followers of openid is not appear in the openid list last, seems to be random, so that pays attention to the user will not be able to get the latest, so could you please tell me what on earth is the openid collation, how to correctly update the user list?