Odd API behavior / apparently random order

I have two tabs open:
"Tab 1" http://openlibrary.org/query.json?type=/type/work&*=&limit=1
and
"Tab 2" http://openlibrary.org/query.json?type=/type/work&*=&limit=1&offset=500000

Each time I refresh Tab 2 I get a different result. It doesn't appear to be ordered by last_modified or date created.. it just seems, well.. random. Ideally it should be ordered by your internal id (OLID, or date created..) so I get the same result each time.

Now here's the really odd part.

Tab 1 generally shows the same result when I reload the page. However, each time I refresh Tab 2, it changes the result I see on Tab 1.

Refresh Tab 1: [{"title": "Modern spherical functions"
Refresh Tab 1: [{"title": "Modern spherical functions"
Refresh Tab 1: [{"title": "Modern spherical functions"
Refresh Tab 2: [{"title": "Byron Harmon"
Refresh Tab 1: [{"title": "Women and social security"

If Tab 2 were changed from &offset=500000, to &offset=100 (or some other arbitrarily low number), this doesn't happen. Tab 1 stays the same.

The same thing occurs with /type/edition (and probably author etc)