First, I don't know the answer so I am just throwing out
ideas.
You refer to webhelp output (or webhelp pro) as if they are
interchangeable. They are not. WebHelp Pro needs RoboServer so
unless you have that, forget it.
It makes me wonder if you have generated both outputs to the
same location and created a bit of a mess. Have you tried deleting
everything from the output folder and creating a completely clean
build?
Is the help sitting on a server or being installed locally?
If it is on a server, why include the mark of the web?
Help others by clicking Correct Answer if the question is answered. Found the answer elsewhere? Share it here. "Upvote" is for useful posts.