Mk Rating variance on loot drops:

[Pepisolo]

Yeah that's odd. Maybe the next time you see an orange item, take a screenshot (F12 if you're running in Steam) and then check your inventory. If it's still not there post the save and the screenshot.

Emma's ability lets you buy orange items at the store, it shouldn't impact drops.

Yeah, definitely gonna do that. I'm starting to doubt my own sanity.

[Pepisolo]

OK, I've worked it out. What I'm seeing as orange is really yellow, and what drops as yellow is really a white level rarity. Someone please tell me that this item text looks yellow and not white?

[keith.lamothe]

Yea, It's definitely yellow.  I'm not 100% sure why it's using yellow for that, as I didn't tell it to, but my guess is that anything that would be white (the default for most text) instead defaults to yellow.

[Tridus]

Oh, yeah that does look kind of yellowy. It's white up in the event log in the top right.

Here's what a green would look like. I find it odd that the white item is white in one place and not white in another.

[Pepisolo]

Oh! Forgot to say, I'm on Linux. Don't know if that matters... hmmm actually it probably does.

I'm seeing other white text fine such as in the terminal as Tridus points out.

[Histidine]

On my (Windows) machine the pop-up text in the world (outside the console) for rare items is also teal instead of blue.

[Winge]

I've noticed the same as well.  Thought it was intentional 

[orzelek]

Loot text color is in tricky state.
I seen yellow (as on picture), green, teal (or dark green?).
Haven't seen blue I think I had some blue items for sure.

[Teal_Blue]

Does the color reflect the color or level of the item you are finding?

Keith or Chris would probably know that right off.