This support ticket is created 5 years, 9 months ago. There's a good chance that you are reading advice that it now obsolete.
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I just tested adding two Views sliders as widgets on a vanilla site using twentynineteen and it worked as expected, and I also tested inserting two slider Views directly in the page, and they also both worked together.
I suspect your set-up involves something other than normal WordPress widgets and sidebars.
Can you clarify how you are making the page and adding the slider Views?
The slider views are added in the WordPress widget area using the default WP views widgets provided by the Views plugin. The main page is made using Elementor Pro. There are no JS errors being reported in the console.
The slider views are set to display random images so each slider will be displaying a different image at any given moment. Why cant I have the same slider view 3 times? What is stopping the functionality?
Just a quick update to say that I see there is already an old internal ticket about this.
Because of how Views are implemented it would require a fairly major refactor of the code to be able to use the exact same View more than once on the same page. It is something that is still open, but I would suggest you should not expect a fix for this any time soon.
For now, you would need to make separate Views, even if they are duplicates of each other.
I think we might as well close this as I don't expect to have any other news for you for some time.