I thought this was just a temporary issue but obviously there is more and more hardware designes being posted on git and i didn't see much of them recognised as Hardware. In my case it was PLSQL and i have seen some others having same issue.
Can you fix that?
GitHub's tool for recognizing the type of code which is being stored in a repository is an open source product called Linguist. It could be that the file extensions or code formatting for these hardware designs is also being used for other languages, making it hard for Linguist to tell them apart. In either case, you will want to follow the troubleshooting steps for your repository's language being shown incorrectly and prehaps submit a pull request to the repository itself.
Hope that helps!