At the moment, User Custom Fields which are text fields have their layout / style scrambled on the Profile page.
This is the case also here in Meta (look in your profile) with the Pronouns field.
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This is a screenshot from meta.discourse.org profile preferences page. I am experiencing the same issue on my test instance.
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This should be fixed with the merge of this PR.
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Yup - all fixed for me (and here on meta of course)
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