Can't view file using web interface but can edit it

Open https://github.com/vishvAsa/AgamaH/blob/5859fb50aeed4a30fecd0e587f31c055a8791d02/hinduism/branches/shaivaH/trikam/tantrasAraH/01.md and you see:

But Sign in to GitHub · GitHub works fine. Where to report this bug?