Issues facing while optimizing the site using WPMU Dev Plugins

I recently installed a few plugins from WPMU Dev Dashboard to help me speed up the site a bit. Though it has improved the speed; thanks for that. There is a wired issue on the products page, tha product gallery appears twice, I have no idea why that is happening. May be I missed some settings while configuring the plugin?

Can you please have a look at it and let me know why that is happening and what can be done to fix it?

I am using a child theme of Avada.
Let me know if you need a list of all the plugins I am using, or the login details itself.

Thanks in advance,