@vjprema Yea, I think that's a bug in the latest version. I looked at it and we have an updated version of the Fosstodon favicon to reflect the new theming with the 4.0.x release, but it appears to be getting overpowered by the default logo. Not sure if that's something we can do anything about other than entering an issue on GitHub though.
https://fosstodon.org/favicon.ico
That's a good catch. I didn't notice it until you mentioned it.