Question Running triple monitor setup - third monitor does not goes to sleep

[Scatteril]

hello.
I do have three monitor setup . if PC left idel . The two monitors goes to sleep while the third does not . They are the same brand and model . If I disconnect one of these two monitors the (third) monitor goes to sleep . But not with all of them connected .
Any ideas ?

 

[Ralston18]

Update your post to include full system hardware specs and OS.

What is the make and model of the monitors?

What happens if you change the monitors physical video connection?

I.e., switch monitors 2 and 3. Does the "lack of sleep" follow the monitor?