please provide more information

Error shows in browser when visiting either site. One of the sites/projects was working fine until recently, without any deployment changes.

yep I was able to extrapolate that, please more more information, such a the domain(s) in question, and their DNS setups, and your nameservers that you are using

1. https://beta.acolab.salon/
   Google Domains Webservers

2. https://www.kreativmyndz.com/
   Wix Webservers

neither of these sites are giving me errors, and are they even hosted on railway?

I'm also no longer receiving the error. And absolutely.

in hosted in the netherlands, railway does not have a region there

Well that's weird being I just updated the site and via Railway.

odd

oh well, all solved

You're about to have me thinking I'm going crazy.

are you sure you are using cnames?

Absolutely.

then yeah the only answer is that you are going crazy

Dang, that sucks.

rip

How often do the certificates update?

far before they expire