Fourloops need help

Somewhat new to wordpress and am trying to develop my own template. In the template I have two calls to WP_Query() to get records listing doctors. In one of them I am selecting based upon a value in a meta field. In the other I am selecting all records. Both loops appear to display the proper information. In between these two loops is a wp_list_categories that also seems to bring the right information. My problem is that it appears the listing of categories is being done for each loop. Please point me in the right direction to solve this