Using Sorting and Filtering and path url at the same time

The bugs will be occurs by doing the followings step by step:

  1. First time sorting request url(inspected by firebug), correct:
  1. filter the month, correct:
  1. second time sorting, still correct, but the request url seems abnormal ([color="#FF0000"]the double slash[/color]):
  1. another filter, previous filters is still here, but the new filter (is_precent = 1) is ignored from the $_GET

    But the new filter name and value is exists in the request url

The $_GET in step 4


array

(

    'ajax' => 'tutor-buffer-grid'

    'TutorBuffer' => array

    (

        'the_tutor' => ''

        'the_course' => ''

        'the_month' => '04'

        'lesson_type' => ''

        'is_full' => ''

        'is_percent' => ''

        'value' => ''

    )

    'TutorBuffer_sort' => 'lesson_type'

)

Please tell me if this is a bug or any setting wrong??

Thanks