Hello,

Can you please add some valid WP credentials in your profile data extra fields? So we can give this a closer look. 
Read this article for more information.

Best regards!

Hello,

Please try deactivating all third party plugins, clear cache, refresh the page and let us know if everything is resolved.

Best regards!

Hello,

Sorry for the late reply!
The Hover Box element used is one of the native Visual Composer elements that is not overwritten by theme scripts. I added this code into your Custom Css box to overwrite the current settings that make the background layer visible before tapping on the image, in iphone mobile.

.vc-hoverbox-block {
    min-height: 175px !important;
    min-width: 350px !important;
    left: -52px !important;
}

Please clear cache and check it.
Let us know.

Best regards!