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If I edit page with a form and leave a section field empty on the following edit it gets populated with the header for that section, so on save it gets duplicated.

For example, say I have the following form

<includeonly>
==Section 1==
{{{section|Section 1|level=2}}}
{{{standard input|save}}}
</includeonly>

I create a page with the form and leave section field empty. A page is created containing only a line 

==Section 1==

But now if I try to edit it again the form loads with section field populated with text "==Section 1==". Upon saving resulting page looks like

==Section 1==
==Section 1==