Sorry to hear about the trouble. Somehow I am unable to check the attached screenshot, so please attach it again. I found a thread related to color picker not working which you can refer here: https://community.adobe.com/t5/adobe-xd/panel-color-picker-picks-up-the-light-color-in-adobe-xd/m-p/...
In case if this doesn't help, please share more details about what exactly is happening along with the version of XD and the Operating System.
Could you please try re-installing the application and let us know if that helps?
Sorry for the delay in resoponse. Please check if your graphic card driver is upto date. Please manufacturer's site to check for the latest update to the graphic card driver. I would also suggest checking if any anti virus is causing the problem. Is it happening with every file or with specific file? Please try signing out of XD and Creative Cloud, restart the machine and then sign back in.
If none of these helped, please connect with us directly using this link: https://helpx.adobe.com/contact.html so that we can assist you immediately on 1:1 basis.
Hope it helps.