Search & offset

I am playing around with musicbrainz and am running into a problem with 
paged search results. See the first query below, offset has been set to 
zero, search results are returned, all fine. Then I set the offset to 25 
(second query) and am surprised to get the exact same results as the 
first query. Please tell me what I am doing wrong here. 
 
Thanks, 
 
Jos 
 
 
curl 
http://musicbrainz.org/ws/2/release/?query=artist:artistname=sting&offset=0 
 
  <?xml version="1.0" encoding="UTF-8" standalone="yes"?><metadata 
created="2014-12-11T14:14:16.427Z" 
xmlns="http://musicbrainz.org/ns/mmd-2.0#" 
xmlns:ext="http://musicbrainz.org/ns/ext#-2.0"><release-list count="292" 
offset="0"><release id="e764910f-daf4-421a-9b4c-6cdf31496c89" 
ext:score="100"><title>Ten Summoner's Tales</title>.....truncated 
 
 
 
curl 
http://musicbrainz.org/ws/2/release/?query=artist:artistname=sting&offset=25 
 
<?xml version="1.0" encoding="UTF-8" standalone="yes"?><metadata 
created="2014-12-11T14:14:16.427Z" 
xmlns="http://musicbrainz.org/ns/mmd-2.0#" 
xmlns:ext="http://musicbrainz.org/ns/ext#-2.0"><release-list count="292" 
offset="0"><release id="e764910f-daf4-421a-9b4c-6cdf31496c89" 
ext:score="100"><title>Ten Summoner's Tales</title>.....truncated