Here's a broken example:
#+BEGIN: clocktable :maxlevel 2 :link :scope file :sort (2 . ?T)
#+END:
* A
CLOCK: [2014-05-24 Sat 10:00]--[2014-05-24 Sat 11:00] => 1:00
* B
CLOCK: [2014-05-24 Sat 11:00]--[2014-05-24 Sat 12:30] => 1:30
* C
CLOCK: [2014-05-24 Sat 12:30]--[2014-05-24 Sat 15:00] => 2:30
If you run C-c C-c on the clocktable, it will update, but the sorting is wrong. It should be in reverse order because it's "T" and not "t".
Now: remove ":link" and try again. The sorting works!