StarTools will not work correctly (or work poorly) with an incorrectly stacked dataset. Getting a suitable dataset from your free or paid stacking solution, is extremely important.
Thanks for all your hard work and a fantastic product that I can't recommend strongly enough!
Chances are that the image looks terrible, which is - believe it or not - the point.
The 'WebVR' button in the module exports your image as a standalone HTML file.
You can convert everything you see to a format you find convenient. Give it a try!