RSS Mod_Rewrite Problems

Ok,
I don’t know what happened, everything with my rss2 feed at https://www.patrickstuart.com/feed/rss2/ was working and now its not.
It does work if you remove the trailing slash, https://www.patrickstuart.com/feed/rss2
Here is my mod rewrite line for this:
RewriteRule ^feed/?([_0-9a-z-]+)?/?$ /wp-feed.php?feed=$1 [QSA]
Not sure what could be causing this, I have 2 other WP blogs set up already and they work fine, and this worked fine before.
Btw, this is the link being generated by the template index.php as well, so it should work.
Any help would be greatly appreciated!