Ultra-nightmare helmet color

[Palek]

Does anyone know what the ultra-nightmare death marker colour means?
White and red are obviously other players and myself.
Then I went into a yellow one. It was myself also, but it was like my furthest run.
So it was pretty obvious to me until I saw yellow in some other place and my best run became light blue.
Is it like blue is 'my best ever' and yellow is 'my best this month'? I cannot find any info about it anywhere.

[Willhelm]

probably just the lighting or something

[Palek]

Are you kidding me?
See the screenshots of other player in this thread:
https://www.doomworld.com/forum/topic/88758-post-your-death-marker-on-ultra-nightmare/
Also see my screenshot of yellow one:
https://steamcommunity.com/sharedfiles/filedetails/?id=1522785621
The yellow one also has three orbiting pentagrams.

[Zer0]

Curious, did you ever find out what the colours signified?

[Palek]

Unfortunatelly, not much more then in my first post.
The only think I can add is that my steam friend's best run is marked with light blue.
So there are two possibilities for my own light blue.
1. There is some kind of glitch where my own helmet is reported as my if I'm my own friend,
2. As I suspected in my first post, after longer period of time my helmet becomes blue and the yellow one is my best run in last, lets say, month.
I'm not able to check this now, because my best run ended in lvl 8 and I'm not able to get there now :)
Tomorrow I'll try and die somewhere at the beginning and I'll check the helmets colour. Mayby it will be yellow again because it will be my best run in a long time.