When I use the UI-Scale Plugin the UI doesn’t scale for other devices but non-scrolling UI’S do ill show the problem below!
Thanks for the Contribution!
Try checking in properties of UI (like TextLable, TextButton…) if they are not sized by offset. If they are sized by offset you need them to be sized by scale.
I usually use plugin called AutoScale Lite (AutoScale Lite - Roblox) that automatically sets offset into scale. I hope this is solution to your problem 
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