After your help I find out, that in the mobile header disappears icon “My account”
Please see screenshots and short video.
https://www.dropbox.com/s/rjd0acc85w3f6sb/ScreenRecording_04-02-2018%2023-55-42.MP4?dl=0
https://www.dropbox.com/s/9970rwnqcu2al9f/IMG_1043.PNG?dl=0
https://www.dropbox.com/s/e4yyac966vwx8cy/IMG_1044.PNG?dl=0
I am not sure was this bug before your help or I get it after. I clear cache and use incognito. Please check and assist.