I have a strange behaviour and don't really what to do :(.
So it's the second reminder emila I get that one of my domain certificates is going to expire,
However when I run 'sudo certbot renew' it says skipped domain expires 02/11/2023 (dd/MM/yyyy).
When I go to my domain in chrom and check the certificate option it also says 02/11/2023.
So in both locations it give me the same date and therefore i'm pretty sure I don't have anything to do.
However i'm kinda confused why that I got the reminder email that one of my domains certificate is about to expire on 22/11/2022.
Your email is from 16:57, but I don't know which time zone that is. Looking at the Date header from your webserver, you're in UTC+1. So that would mean your email was send at 15:57 UTC. At that time, your certificates weren't renewed, so the email was justly send.
So I'm a little bit confused what the "strange behaviour" is exactly? Your certificates weren't renewed. Let's Encrypt send an expiry email. Afterwards, your certificates suddenly, 8-9 minutes after the email was send, were renewed. Sounds correct to me.
I have received the mail to tell me that my cert will expire in 9 days,
So I logged in my reverseproxy and did 'sudo certbot renew' the output said all certs skipped due to expires on 11 february 2023. So this tells me that the certs haven't been renewed, but just skipped.
Yes, Certbot skips renewing already renewed certificates which are not due to expiry for some time. Somewhere in between the expiry email and you seeing the "skipped" message, Certbot did its job of renewing the certs already. You could take a look at the log file in /var/log/letsencrypt/ which was created today at approximately 17:05 CET. There would be more log files earlier and later, but the file from approx. 17:05 UTC should show the renewals happening.