I am attaching doc file which after converting not rendering properlyClacken_FormatPic.zip (1.8 MB)
In your case, we suggest you please save the document to HtmlFixed file format. Please check the following code example. Hope this helps you.
var doc = new Document(MyDir + "Clacken_FormatPic.docx");
doc.Save(MyDir + "19.3.html", SaveFormat.HtmlFixed);