Postman Desktop reports Self signed certificate in certificate chain, web does not

I fully appreciate this could an issue on my understanding as I by no means an SSL certificate expert, I know enough to request, generate and apply them.

Recently I had to update one, but since that point the desktop version of postman is reporting “SSL Error: Self signed certificate in certificate chain” while the browser version has no issues at all. I can turn of the SSL check in Postman, but doesn’t really help for clients.

Checking a couple of sites, the certificate is reporting fine as far as I can tell (see attached), so I’m not really sure where to go from here and any advice would be appreciated.