Why is my eye dropper tool not selecting the true color?

When I'm selecting a color to sample from (in the sample - the blue from the mouse), it's not pulling a true color, it's always muted. I can't figure out what setting or issue is causing this?

It's been doing this for months but it doesn't always do it which is even more confusing. It will pull a true sample on one project and then it won't the next. Today I'm trying to pull the blue of the mouse but as you can see it's bringing back a much lighter swatch.

Does anyone know how I can fix this? TYIA!