I have this domain that I recently brought:
But if I access to:
It shows the website where I brought the domain from, why is it doing this?
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DNS propagates slowly, it may have reached some DNS servers but not others, this process can take a few days to propagate entirely, be patient.
When the domain was first set up, it could have been done with just one of the A records, and the second might have been added in a later stage of the setup process, and thus delayed.