The code not valid / breaks a plug-in of Contact Form 7

Popups The plugin is not valid HTML. Please make a valid code.

Error: Element style not allowed as child of element body in this context. (Suppressing further errors from this subtree.)

From line 1499, column 67; to line 1499, column 89

-popup/–><style type=”text/css”>? #spu

Contexts in which element style may be used:
If the scoped attribute is absent: where metadata content is expected.
If the scoped attribute is absent: in a noscript element that is a child of a head element.
If the scoped attribute is present: where flow content is expected, but before any other flow content other than inter-element whitespace and style elements, and not as the child of an element whose content model is transparent.
Content model for element body:
Flow content.

Error: No p element in scope but a p end tag seen.

From line 1545, column 74; to line 1545, column 77

orm></div></p>?</div

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Because of a plug-in of Popups investments in a plug-in of Contact Form 7 have ceased to go.

I have switched off a plug-in, both mistakes were gone. Now a code completely valid and investments in a plug-in of Contact Form 7 go again.