Form.TextArea loses is Lato font, even in your website https://react.semantic-ui.com/collections/form/
It was happening in my code but I checked the website https://react.semantic-ui.com/collections/form/ with chrome and safari and find out that the same happens. The textarea font is changed from Lato to Arial. I found a bug but it was closed from 2018, thanks!
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I have to style my component in order to look alike the others <Form.TextArea style={{ fontFamily: 'Lato' }} />