Problems since WP update

Dear all,

I hope this is the right forum to post this topic.

I’ve been experiencing problems with the v 4.0 of the enigma theme.
More specifically, there is an extra header appearing on every pages. Furthermore, the text of my pages which is not of the “paragaph” type, e.g. “< h2 > … < h2 >”, is published as if the color font was the background font, i.e. it is not visible.

These problems appeared only once I updated wordpress to v 4.9.1, any idea on how to fix them?
Thank you for your help.

The page I need help with: [log in to see the link]