Reply To: support mail not found

No, you haven’t set the email. In the database it’s empty.
Please check your databases table wp_options for the entry “reservations_support_mail” and set it’s value.
Can it be that you have two wordpress installations? Else I can’t understand this, as I believe you that it seems correct in the settings. My plugin tries to load the wp-config.php from the root folder, which is defined by the siteurl in the wordpress main settings. If that settings leads to the other wordpress installation it will use that database too.
Regards