I am not sure why this is happening, but all orders related e-mails are being send to customer using the vendor e-mail instead of one of the marketplace default e-mails.
Is there any way to send e-mail using the default marketplace e-mail instead from vendors e-mails?
I found a option inside the settings > e-mails named "Send vendor emails from marketplace email addresses", but I tried with it enabled and disabled and nothing changed.