Ah I see now.. thank you.
To resolve try adding the following to the Custom CSS field of your templates parameters...
@media only screen and (max-width: 767px) {
.backgrounds {
display: none;
}}
Failing that may I suggest sending temporary administration access to your Joomla installation to info@joomla51.com and we will examine this issue further. For our reference please paste a link to this post in your email.
Ciarán