The content page get blank for some users

Hi, I am facing bug that struggles my client to use the uipress admin theme, when i active the admin theme to the useres they try to open any page… but the page get stuck in white background, and for some reason the side menu appears inside the content page (seems you are see the entire interface again in side the content page area)

FYI I am using the latest update of uipress, and all my plugins and Wordpress core up to date.

Hopefully you can share a solution since I stopped using this plugin untill I find solution and inform my client.

Thanks.