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After searching I found this:

"Visibility

Your jam is only visible to you and other admins until published.

Published — Jam is visible and ready for submissions and ratings when appropriate

Unlisted — Jam will not be listed on itch.io jams page"

Could be the case? Maybe you should try change it for more people to join. 

See, that's what I thought too, but when I went to check the "Published" option was already checked off.