yii cgridview refresh casues multiple ajax cals

yii cgridview refresh casues multiple ajax cals

anyone aware why does yii cgridview refresh button causes multiple ajax
calls.
when i refresh, it causes the following ajax calls (this time its 3 and
sometimes its 4 and 5)
GET
http://localhost/ijob-css/index.php/activities/d.../activities_id/13/source/iJOB?ajax=sessions-grid
200 OK
320ms
jquery.min.js (line 4)
GET
http://localhost/ijob-css/index.php/activities/d.../activities_id/13/source/iJOB?ajax=sessions-grid
200 OK
266ms
jquery.min.js (line 4)
GET
http://localhost/ijob-css/index.php/activities/d.../activities_id/13/source/iJOB?ajax=sessions-grid
200 OK
262ms
jquery.min.js (line 4)
sometimes it becomes 4 or 5 ajax calls to the same URL.
but only first time, it works properly i mean refresh happens one time.