Parsing of this RSS feed is busted

#1

Feed URL: https://www.groovehq.com/blog/feed

It validates: https://validator.w3.org/feed/check.cgi?url=https%3A%2F%2Fwww.groovehq.com%2Fblog%2Ffeed

There is an item in that feed named “What I Learned Rescuing Our Startup From Death”. It has a pubDate of “Tue, 23 Jul 2019 16:00:00 +0000”. But NewsBlur shows it as being published on “06 Jun 2019, 9:00am”. Why?