Long custom field name for Radio Buttons and Multi Checkboxes will overlap with the custom field name that located below of them.

Refer to the screenshot.

But there are some alternative methods for this issue where other users can consider about it.

• Description of Custom Field can be question and if user have JavaScript experience, you can inject some extra html there and enhance your description test.

• Using Message Custom Fields as question where user can get from this 3rd-party plugin, JIRA Toolkit plugin.