Blocksy Companion break css

Hello there ! First i’m sorry for my English its not very good.

I started using Blocksy theme very recently (awesome btw, thanks for your work)

The theme was prompting me to install “Blocksy Companion” so i gave it a try.

When this plugin is active, it break the CSS on my website, when its not everything is fine.

Everything is up to date, no other plugins installed beside companion.

Thanks !