RSS Sort Order problem

I’m trying to get my blog shown in different forums and I have two feed settings

https://sarahk.pcpropertymanager.com/blog/wp-feed.php

https://sarahk.pcpropertymanager.com/blog/feed/

The first sorts in descending order. I can’t work out the second one’s order. How do I set the sortorder without hacking the code? Is there a standard setting?

thanks

Sarah