In a Form with multiple sections, if the one is left empty but a later one populated, then attempting to edit the page later using the form will result in the whole later section appearing inside the text field of an earlier populated section.
Partial Form definition:
{{{end template}}} '''Story:''' {{{section|Story|hide if empty}}} '''Gameplay:''' {{{section|Gameplay|hide if empty}}} '''Screenshots:''' {{{section|Screenshots|hide if empty}}} '''External Links:''' {{{section|External Links|hide if empty}}} '''Free text:'''
Screenshot of "Gameplay" section having gobbled the contents and heading of the "External Links" section: