I must have missed this post - my apologies. The annotations certainly should not be doubled. I'll run through some tests to see if I can reproduce what you are seeing. As far as the annotations not looking exactly the same on Windows 10, that's due to the very different way in which annotations are rendered on Windows 10 versus Android because I utilized Microsoft's default framework for rendering. The upcoming annotations redesign is switching the Windows 10 version to Win2D, which means it will use a rendering framework that is very similar to what Android uses. This should hopefully result in the annotations matching up perfectly between Android and Windows 10. There is nothing I can do in the meantime to address this - you'll have to wait for the redesign to be finished.
Mike
Mike