Blank pages on Desktop view

Hi i am getting blank pages when i view my site on various desktops, on an ipad some pages are still blank, but it mobile everything works fine, please help!!! However on Desktop view when i change the window size the content comes, otherwise it is blank, please advise?

This issue is happening on the following page –

https://fashionablyin.com/members/

https://fashionablyin.com/login/

https://fashionablyin.com/register/

Basically all pages to do with the Ultimatemember plugin, please help!