Jetpack Twitter feed cache issue

There’s a Twitter feed on Bradbeckstrom.com that uses the Twitter Timeline (Jetpack) widget. I noticed that whenever a new Tweet is posted, the feed doesn’t update as one would expect unless I go to this URL and hard refresh to get the new Tweet to show up:

https://twitter.com/The_Frug?ref_src=twsrc%5Etfw%7Ctwcamp%5Eembeddedtimeline%7Ctwterm%5Eprofile%3Athe_frug&ref_url=http%3A%2F%2Fbradbeckstrom.com%2F

I don’t know if this is plugin-specific or Twitter-specific, but it’s someone’s issue.

The page I need help with: [log in to see the link]