Process Builder email alert sending to user but not contact

I have a process builder that fires when an opportunity stage is Delivered, and a date field is in the past. This triggers 2 email alerts, one sending an email to the opportunity owner, another to an email field on the opportunity.

Checking the email log files, the email is sent to the opportunity owner, but never to the address in the email field. They are all valid email addresses and both alerts are set up the same. (Screenshots below). Why would this be happening?