Solution for this topic
Sorry to hear of the problem you are having.
I have tested it on my test site and it’s working fine for me using latest version of Jevelin theme.
Please make sure you are using below latest version of Jevelin theme and Unyson plugin.
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This can be due to plugin conflict on your site so please try temporary deactivating all plugins except Unyson plugin and see whether everything works fine and then enable the plugins one by one to see which plugin is conflicting if any.
Also could you please try resetting your site htaccess file as described on the following pages?
If you are using firewall then try changing the settings of it.