You are welcome :)
I didn't use cache plug-ins for my WordPress websites. There are other users who have problems with WP Super Cache. It's sometimes not compatible with the themes and plugins. I think this was the same for your website.
There are good reviews about the W3 Total Cache. I didn't have experience with it so far. You can find it here: https://wordpress.org/plugins/w3-total-cache/
Also WP Rocket is a good one, but it's a paid version.
I saw at your site that you have domain.com/wp. If you want to change it to your root folder (domain.com), you can follow the next instructions: http://codex.wordpress.org/Moving_WordPress
Before you install or change something, please back-up your website and database!