Color picker - desaturated colors, not grey.

 Hi there guys! I'm having a lot of problems with the newer Photoshop versions, but because there are neat new features, I struggle with using the new one.

 Anyway, so...I saw dozens of similar topics, but none was as specific as this OR having a solution for this problem. So I'm currently coloring an illustration for work and I have a color palet on a different document that I need to use, so I pick the color from one tab, click on the other and draw. The colors appear desaturated. Not grey, just desaturated. I checked everything. The mode is RGB 8 bit, color profile is sRGB IE, the color picker is set to Point Sample...everything I found as a fix is fine on my PS. So I started to think the problem is me, so I filled both documents with the same solid color, made a screenshot and open the screenshot and as you can see, the right one is different. 

https://imgur.com/pfJROvo

Can you help me fix that?