By default, DITA2Go provides closing tags </tagname>, to conform to W3C validation requirements for XHTML. (One exception: unless you specify XHTML as the output type, DITA2Go does not generate closing tags for list items; see §30.10.2 Converting list formats to HTML list styles.)
To eliminate </p> closing tags:
[HTMLOptions] ; NoParaClose = No (default) or Yes (suppress </p> closing tags) NoParaClose = Yes