php - Order Pages by Custom Field Value -

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i have set several pages including custom field numerical value. when querying pages want display them ordered custom field numerical value lowest highest.

this code using:

<?php      query_posts(array('showposts' => -1, 'orderby' => 'meta_value', 'meta_key' => 'price-medium', 'order' => 'asc', 'post_parent' => 1286, 'post_type' => 'page'));     ?>

for som reason sorting not working , pages being shown scattered not price order.

can have idea or suggestions in how go ?

i managed sort issue changing 

'orderby' => 'meta_value'

to 

'orderby' => 'meta_value_num'

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