Hi,
I’ve changed background image in the Jumbotron Section, and even if the Enable parallax effect is on, and I can check it is working in the preview area, after publishing the modification, the parallax effect is not working.
I can confirm the everything was working before changing the background image.
I’ve cleaned safari cache (I’m using a mac) on macbook and to be sure also on iPhone ad iPad.
I’ve reopened Safari on all the devices but at the end I’m having the same problem (on all the devices)
Please deactivate all third party plugins and try again your problem, most probably this I conflict with third-party plugins.
Once you deactivate all plugins please check your problem again, if the problem is gone then this means it was a plugin conflict. Now, start activating plugins one by one and same time repeat your problem until your problem appears again, now you know which plugin was in conflict