This problem has existed since at least September 1st, 2016 (SW has identified two causes), not yet solved, discussed in another thread. The render orientation fails to update especially after using 3D Tools. So even if you make a new listing, if you use 3D Tools, you'll likely have the same problem.
Link:
https://www.shapeways.com/forum/t/renders-not-updating.52798/
It affects several of my products, too.
Here's the latest from SW:
Last edited: Feb 22, 2017