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Starting line 170, </p> is being flagged (twice) as not required because there is no open <p> element, when in fact there is an opening <p> just a few lines above it in both cases.
The example document at the given URI has many errors but not the one you mention. In HTML some end tags can be omitted, and some constructs will be interpreted as implicitly closing them. e.g <p>some content<div></div></p> will be interpreted, in HTML, where a <p>cannot contain a <div> but can be implicitely closed, as: <p>some content</p><div></div></p> You can see why the validator will see an issue with the </p> If you don't want this (implicit closing), you can use XHTML where all end tags are required.