That sounds like a classic case of nested tags in the rendered html.
Nested forms are not allowed in html, so if the included portlet renders an html form, make sure the parent portlet does not include that portlet inside of another form.
To prevent nested forms, either move the ‘portlet include’ control outside of any other form controls, or change the outer form control in your parent portlet to use a ‘Disjoint Form’ control instead of a ‘Form’ control.
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