Problem
Different contributors to the same account in the repository.
History
When I created the repository, I uploaded some files through github's own site and the commits were registered as mine. However, when I made commits from the command line and then pushed, it appeared on the github website as if it were somebody else doing the commit. But it's the same account that I uploaded initially.
Suspicious
I suspect that other commits have been "verified" with GitHub's GPG Key. But I do not know what it is and so far I have not been able to send commits signed by the command line.