Activating this causes another plugin to dissapear from sidebar

Activating your plugin causing the “Performance” link in the left-hand sidebar to disappear. This is the “W3 Total Cache Plugin”. Which I’m sure a lot of people use, so might want to look into it.

I’ve also posted in that plugins support forum.

https://wordpress.org/support/topic/scroll-triggered-boxes-plugin-causes-your-menu-item-to-disappear?replies=1#post-6416519