Corrupt meshes in HTML5

Hi, when I build my project for HTML5, my meshes get corrupted and look like this:

Note that the geometry is messed up…

It looks like this in editor:

Does anyone know what is causing this?

Additionally, when I build for windows it looks like this:
(like the reflections and lighting is not working correctly)

I am using the 4.4.0 Preview, and have tried increasing the amount of memory available to the HTML5 build, which done nothing. I am running the HTML5 version in Nightly.

I have set the scalability options to their minimums and maximums through blueprints, but neither solves the problems.