It is because you put the time in as UTC using the "Z". So you said "I want to use Pacific Time, and the time I want the flow to run is at 9:00AM UTC", so it runs at 9:00AM UTC which is 1:00AM Pacific Time.
The "Z" is what is telling power automate that this is UTC time. Instead just put AM or PM and see if that works for you. Or you could change it to 5PM UTC time (17:00:00Z) which would be 9:00AM Pacific.
Whenever you put "Z" in the time, Power Automate reads that as UTC.
