Hi Yue,
I believe the issue is not with your repo. We recently released a change which unfortunately might be causing this bug. Could you try either hard refreshing your browser or using a different browser then creating a new project from github? Here is a link to how to hard refresh in case you aren't sure: https://www.namecheap.com/support/knowledgebase/article.aspx/10078/2194/how-to-do-a-hard-refresh-in-chrome-firefox-and-ie#chrome
Please let me know if that helps.
Thanks,
Ming