I had the same problem when I just bought a second monitor. The whites had a pinkish hue. I kept clicking factory reset didn't help. I adjusted the color on the monitor that helped a little. I used the Nvidia control panel to adjust the color and that seemed to work.

Monitor Calibration what you need.

https://www.howtogeek.com/342756/how-to-match-colors-on-your-multiple-monitors/

Jazlan, tried that. Didn't help. All 3 monitors, identical models, at factory settings, SHOULD be the same.

Al, I have a Radeon card. I will look again, but I haven't found any help there.

I have a suspicion that it has to do with the hookups.

EDIT OP:

One is hooked up straight HDMI, one is DP to HDMI, and the one in question is DVI to HDMI.

Radeon should have a control panel to adjust colors. Try switching the cables to see if it's the monitor.

If the Monitors NOT color-corrected and calibrated Proffesional GFX Artist usable modells - then every single one have an more or less "own" represantation of the colors ... even more if it pure gaming monitors ... if you buy 2 ,and have luck the are close ... ore not with unluck ...

Regards

You have done the Spyder5 thingy and you still have the problem? 

That is strange.

No, I do not have the Spyder5 thingy. I did the calibration via windows settings.

Than you need to. From what I know. Same model, different batch might have different result. I run production before. Sometimes component change can have different effect. But if still within technical spec. It will pass QA Check.

I can't spend 100 bucks on a Spyder5 thingy.

Manual adjustment should do it. Cut down that red in your RGB setting. Might help.

That's what I was going to suggest, that different batches can possibly have slight variations, especially if one or two components are different due to availability, etc.  In some cases, it could be that identical models are assembled in different factories, which may also cause a slight difference.

I tried all the manual adjustments before posting this thread.

Including with your tongue in your left cheek and your eyes squinted?

If that's the case, then, I'd be asking for my money back.  

Seriously, it could well be that you have one with a slight operating difference due to a different batch or internal components, etc.

Other than that, can you connect all 3 monitors using the same method for each: ie; using 3 HDMI leads without adapters?  Or all 3 via DVI? 

I have an ASUS Republic of Gamers card with 3 DVI slots [and a Display Port], but usually graphics cards do not come with 3 of the same connnection, so I'm thinking maybe not.  Unless you have another card with 3 DVIs that you can use to test the theory.

But yeah, that may be a contributing factor, 3 different connection methods, with the DVI to HDMI being the weakest link, and therefore not producing such a strong signal as the other 2, higher value connections.  Other than that I'm out of ideas.

Anyhow, all the best with it.  

Monitor gamuts really can't be manufactured to be perfectly exact no matter which producers or quality.
The range of electronic components in such hardwares is very high... so, it's almost normal to suddenly realize there are variations of rendering in more than just black contrast ratios or specific hues focus not counting Blue-Light or lackthereof.

Most of them can receive slight RGB+ scaling adjustments as long as you can get your hands on good enough calibration programs/software. Yet.. the trick with human vision is somewhat complex under many type of conditions -- lighting, angle, distance, perception, etc. It's very hard to reliably find perfect environment(s) where absolute precision exist. Example of solutions below. Search online for more if you must.

Calibration!