Only one category displays after downloading arras theme

I just am starting a new blog using wordpress. We have our own servers and so we finally got everything setup on our end so that wordpress worked. As soon as I was logged in we were excited to get started. We immediately added some categories and then noticed we could change the theme. I did that to the Arras Theme. Now only the first category displays. The other ones show in my admin section, but can’t get to them using the website. Any suggestions?

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