It looks like all 3 are set to the same binding:
<?php echo($WA_DFP_UploadStatus["WA_UploadResult2"]["serverFileName"]); ?>
It should use:
thumb = <?php echo($WA_DFP_UploadStatus["WA_UploadResult1"]["serverFileName"]); ?>
image2 = <?php echo($WA_DFP_UploadStatus["WA_UploadResult3"]["serverFileName"]); ?>