Unfortunately, with Windowblinds you can exclude an application from it, but WB still change the system color. And if an application use system color it will use the color that was changed by Windowblinds. In your case the theme change some part of the system color to light. That is why you see a white/light color on your dark theme apps.
If you prefer the dark, than why not use Windowblinds that work in dark mode. Something like my screenshot below. Night Shine by Vad_M

Thank you,
Basj,
Stardock Community Assistant