Strange mismatch of pid and radio program

[general]

Hello everyone,

the program (Composer of the week) can be streamed correctly in web 
browser, but when I use the pid "b03kp831" to download, get_iplayer 
always downloads the next program of that day (Radio 3 Live Concert).

     http://www.bbc.co.uk/programmes/b03kp831

This may be related to an internal parsing problem on BBC website, since 
the link below also returns the unexpected mismatched program with the 
SAME pid.
     www.bbc.co.uk/iplayer/episode/b03kp831

Any help please?