Filtering by multiple conditions in the loop

You cannot mix array syntax and string syntax in the same argument. If you start with array syntax, you should stick with that, the same applies if you start with string syntax, then you should stick with string syntax. Because you are using post__not_in which is an array, you should stick with array syntax

<?php $query = new WP_Query(
    array(
          "post__not_in" =>get_option("sticky_posts"), 
          'paged' => get_query_var('paged'), 
          'meta_key' => 'Sortdate',
          'orderby' => 'meta_value',
          'order' => 'ASC'
       )  ); 
 ?>

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