Hi,
Thanks for using our plugins. I can help out here.
What are you using as the RSS feed url? The exact url?
If I use this url I get the correct order of events showing in my browser:
http://greenwoodcalendar.com/events/feed/
So it looks like the coding is correctly ordering the rss feed from our plugin.
It appears the rss reader on the other site is changing the order.
You might have to create a custom rss reader to reorder the events correctly.
Unfortunately, as rss was designed to show the latest content first it can create issues such as this as events do not follow that rule.
I can try to help out some more here, but unable to provide much more on this as it is not a feature we support.
Thanks