Information about incompatibility

I like your plugin very much! The theme ?the7“ has a simple version of your plugin allready installed (I think it’s part of “mega addon”, “ultimate addon” or something like that). The problem is, that your plugin is incompatible with the7 for that reason.

Here is the test site: https://bit.ly/2Lvvk5z
This is the site should look like: https://bit.ly/2PNhIpK
As you see, all background pictures are gone.

If you have any ideas or suggestions how to fix that, let me know!
Thank you very much!