The “View Mobile Site” at the bottom (when viewed on my Iphone) gives you a toggle between two different versions of the mobile website.
You have a plugin (Jetpack?) which is creating their version of a mobile site, so you have two available.
Selecting “View Full Site” gives you the normal mobile responsive Epik site view. There is some plugin not related to Epik which is giving you that extra feature. Looks like you should disable it as it’s not necessary with Epik.