Copy/paste = same component on every screen instead of a single duplicate?

Dear community,

I am new on Figma.
I am working on an iOS app mockup, in the “Design” section of Figma.

When I copy/paste certain components, it creates as many copies as there are screens and it positions them in the same spot on each screen.
It could be useful in certain cases, but not in mine.
How can I disable this?

Many thanks!