Sub Grids Not Loading on Form

Hi Everyone, 

Have you encountered a scenario where in one of the CRM environments (luckily not prod), the sub grids on the account (renamed as customer) form were not loading and has a hyperlink to load but nothing happens? This happens on IE and Chrome, for Edge it partially loads some and for Firefox it is fine for us. But for the client who reported the issue its not working on any browser. Our CRM is Online 8.1.0.581. 

IE/Chrome:

Edge:

Firefox: