Hello PaulN215,
It sounds like your scenes are being triggered at the same time, but they're in different time zones. Is that right? We understand how important this is to you and we are here to help. Starting with the resource Set up your HomePod, HomePod mini, Apple TV, or iPad as a home hub was a great idea.
As a test, if you set each automation to run at an exact time rather than Sunset, what happens? Create scenes and automations with the Home app
Regarding the automation that runs at the expected time, is that the house you are in?
Also, what device are you using as a home hub? Is it fully updated?
Cheers!