Order Details Text Not Tracking Me

Hi,

I'm going mad over this and there is probably some simple setting I am over-looking. The Order Details Number is blue (see photo to see what I mean), but once I have been into the order it turns purple. Which is great as it is how I keep track of where I am. Well, it used to change, but now it just stays blue. Anyone else had this issue? Is there something I am missing? I have checked my settings and they seem to be the same as usual. I have even re-started my computer, but I still have the issue. Or is it just Amazon f-ing around as usual?