Hello @Jackson Farnsworth,
this is a known issue which is asked many times before. I attach you a link to another question:
I hope this will be a thing soon!
Only particular list of Custom Field types may be used on Customer Portal https://confluence.atlassian.com/jirakb/list-of-supported-custom-fields-for-request-types-in-jira-service-desk-customer-portals-867182673.html
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