I sent an email from the past

So I'm not sure if this is a bug or a VPN or a Time Zone issue but I wrote an email this evening 09/12/25 and at about 18:00pm AEDT I scheduled the email to be sent 8:00am tomorrow. I saw the email pop up in the scheduling part of the side bar. An hour or so later I went back to edit the email and the scheduled box had disappeared. I found my email in the sent folder...it says it was sent at 8:00am this morning 09/12/25...spooky

I have the free version.

This is only an issue because in the email I refer to a phonecall that happened at 11:00am 09/12/25, now apparently three hours after the email was sent.

Is Proton mail a time travel device and how do I make it stop?