Ted here from Shopify, thanks for reaching out to us!
This is quite strange, would you be able to describe the steps you are taking in a small bit more detail? Just so I can gather as much context as possible to help you further. For example, when you open the orders page in your admin, where are you clicking exactly to try and open the order? As well, what device and browser are you using? If you use a different device or browser, are you able to replicate this issue?