So here’s the deal, discourse does not have the ability to put in a separate logo for different themes. I’m currently writing some CSS code to basically delete the old logo and insert a new one for light theme and am running into some issues where the software is automatically scaling the logo and making it look off.
I know how frustrating it could be when forced into one theme or another (I cannot stand light themes on forums myself), so I decided to allow it to run this way for now until I have time to sit down and fix this properly.
Thanks everyone for your patience. This weekend I will clean up the logo spacing on the light theme to match the dark theme.