Use a tool like phpMyAdmin to check your databases directly.
Open the (your db prefix)_options table in the database for the problem site.
Then check the row where option_name = siteurl and see if the option_value is correct.
If not, correct it and you will be able to login to the wp-admin of that site.
You may still need to correct other urls too; this is a good tool for changing urls.
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