bug for multi insert for single mysql query

Hmmm. Need more info.

Which version of CI are you using?
Line 158 of your Get controller is the "this->db->query($sq);" shown? and it is using the query string shown above that, even though it is assigned to a different variable, $q?
The error message is the only output from the request?
Does anything get inserted into the database?

CodeIgniter Version is 3.1.10
yes, $q / $sq they are the same variable

 the website link here
http://non.asuscomm.com/ball/get/test1
http://non.asuscomm.com/ball/get/test2

codes here