i've recently changed my site theme to the dark/blue color, but only my profile is displaying correctly

the rest of the site is still the default blue

Did you change it here? https://forums.d2jsp.org/settings.php
Also try to clear your browser cache.

ah, i didn't try to change it there. i used the notepad/pencil icon to change it

thank you very much

Yes you can have a different display in both your forum browser settings and your profile settings.
Whatever you set your profile display settings to everyone else sees.