Hello,
Please note that enabling Widow/Orphan Control as true in Word doesn't assure that all lines of the same paragraph are in the same page. These terms (widow and orphan) refer to one (and sometimes two or three) lines (https://wordribbon.tips.net/T012695_Controlling_Widows_and_Orphans.html).
To accomplish this task as you require, you should enable the option "Keep lines together". This setting can be enabled when transforming HTML to DOCX using the following style:
page-break-inside: avoid;
After purchasing a license we can provide further support if needed.
Regards.