this is not working properly

Hi

This plugin in to the use of the page & post in set the php code but after so many change time click then ‘<?php’ this tag convert in to the html special character string ‘<?php’ this resin my php code is not working
Also wp admin panel in to the set the php code & click in visual then click in to the update button then php code is convert in to the ? plz check this issue.

Thanks
bhadresh ganjawala