I use custom fields - text - on iOS and on the website. If I view the card on iOS I see the entire text field, as desired. On the website, the displayed field is very short. The data is all there, but is shows only the last 20 characters. This is a bug.
Sorry for the confusion. Currently this is expected behavior. The custom fields section of card in the web version of Trello adheres to a grid system. To maintain that, text fields with enough characters are truncated. The mobile versions don't follow that same grid in a card back so the text is not truncated there.
I'll definitely let our team know about your interest in that, because I do agree it would be great to have parity with that behavior. I hope that helps explain.
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