Sure thing.
It is a Joomla plugin called "Login as User" by Web357.
www.web357.com/product/login-as-user-joomla-component
The plugin works well, and integrates with the Joomla user manager to allow you to log in as a user with a simple click. In the latest version of HikaShop it looks to be interfering with the Orders page by messing with the columns that are displayed.
I have posted a support ticket on their page about it, but haven't heard from them yet. At the moment, I just have the plugin disabled on the website.