I have deactivated the wp.me URL shortener in Jetpack and I am using the Tweet This plug-in configured to use my custom URL shortener.
When I edit any post and click the Get Shortlink button, I get the correct shortened URL generated by my shortener.
But when I use the Jetpack's sharing buttons to share my post with someone (i.e. via e-mail) it sends the full post's permalink and not the shortlink.
Any ideas what might be wrong?