LTS release tier should not update faster than STABLE
LTS (18.104.22.168 Mon Jan 4 16:28:20 2016) is on a newer version than STABLE (22.214.171.124 Tue Dec 1 18:45:09 2015) per http://httpupdate.cpanel.net/, and in fact cPanel support confirmed it tracks with RELEASE rather than STABLE (though it won't automatically update you to the next major version like RELEASE does).
I think LTS should not update faster than stable because when 11.52 hit RELEASE (10/12/15) but before it hit STABLE (11/9/15), quite a few bugs were fixed (see https://documentation.cpanel.net/display/ALD/11.52+Change+Log). If LTS is being pitched as an alternative to disabling updates altogether (per https://documentation.cpanel.net/display/ALD/cPanel%2520&%2520WHM%2520Long-Term%2520Support), it doesn't make sense that it'd be on track with RELEASE rather than STABLE.
Also, this is also different than how LTS releases typically behave for other software packages.