Stop duplication of files between pools

Hi I am pretty new at this, so it might just be me who has done something wrong.
But my issue is, I have 2 pools with 2 mirrored drives in each, so 4 drives in total.
I want to keep the pools separated, but have just spotted that, the files on the first pool, is now showing up on my second pool.
I don’t know why? and I don’t know how to stop that. I have been googling for hours but simply can’t figure out what my issue is. Hope someone in here can help me

You really need to expand on this question.

How do I stop pool 1 from copying files onto pool 2.
That’s my issue

Ask it nicely?

There’s barely any information provided.

How is anyone able to help you? Where do we start?

I think all of us would appreciate at least the following details so we can help you better:

Output of the following may help:

zpool status
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…and with the information you’ve given, the only answer we can give is “don’t copy the files from one pool to the other.” Because there’s nothing in TrueNAS that will do so on its own. Now, if you’ve (for example) set up replication from one pool to the other, that would certainly do it, but I don’t think you’d then be asking how to stop it.

So, yeah. A lot more detail about how you’ve set things up and what you’re seeing is going to be needed.