WP QUADS Settings Page Showing Unwanted Codes and Displaying my Own Ads

I’m afraid of buying the pro version. I am willing to do but for a last few days I noticed some wired codes and display ads of my ad codes in the settings page of the WP Quads plugin. Check the screenshot of error here.

And most of the times I notice my ads not showing.

Please help. I liked WP QUADS plugin a lot and even featured it on my blog (https://allusefulinfo.com).