Problems with the view when using GUI for HTML

An odd one this, I'm hoping someone has seen this behavior before.

I've attached 2 screen shots as it will show the problem better than I could describe it.

The same transaction (MD04), the same Material, the first screen shot is GUI for Windows, the second is GUI for HTML using a Web Browser.

It's not just this transaction, CS03 (for example) does the same.

Has anyone seen this before? Any ideas?

Thanks.