A 'Query' marker means that the account is being looked into by your lender. This can affect your credit score as lenders could be unsure whether to lend you money or not.
If you’re unsure why this is showing on your account, we’d suggest contacting the lender linked to the account.
If you’ve done this and they’ve confirmed this shouldn't be showing, you can raise a dispute with Equifax to fix the incorrect information.