HTML5 Display Issue - mesh all whacko

I have an architectural visualization project that I am working on. The idea is to create a virtual walk through on the web. I have made a very simple house in Revit and have used the Datasmith plugin to export from Revit and have imported it into Unreal.

Everything works, for the most part, but I have some display issues with some railings that only appear in a web page. The railings display fine in the editor, when launched to my computer from the editor, and even a exe build displays the railings just fine. It’s just HTML5 that is having issues. I have attached a screenshot of the issue with examples from each.

When I say “for the most part” I am also experiencing materials not coming over to HTML5.

Any insights would be most appreciated!

can you see what the “mobile previewer” looks like?

html5 uses the mobile rendering path. here is how you can do this: