Related lists duplicates on all tabs when using canvas

I'm trying to add a timeline on a tab using canvas.

I put it there and fit it to the right size.

But then that related list shows up on all tabs at the exact same place and overlaps everything there... why are my related lists showing in all these tabs? i want it only where i dropped it.

im showing an example here, intentionally badly placed so it's evident.

it's there on every single tab. and if i deleted it in one place, it deletes it everywhere.

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