Hello,
Thank You so much for more insights on this. We are not really sure about the issue as you mentioned this does not occur on any Major Browser and the list of the Compatible Browsers. Additionally, there are no codes that could cause the Jump, except for Window Resize function, that would make a Full Screen Slider fit the screen.
Currently, we will not be working on fixing this as this does not occur on any major browser and this could also be an issue with the Browser itself. But if we find any further leads on this, we will definitely notify you regarding the same. Thanks for your Patience.
Meanwhile, do let us know if we can help you with anything else or if you find any further issues with Canvas.