sort / limit / range problem

Hi folks,

I've got a glossary table that I'm trying to render to HTML.  However, I've 
got a problem when using order by and limit.  Below is an example of  a psql 
session showing my problem. Anyone got any reasons why the last select misses  
'Driver'?

nymr=# select glterm from glossary where glterm like 'D%' order by glterm;    glterm
----------------DampersDartDetonatorsDisposalDomeDraw BarDriverDriving WheelsDuty Fitter
(9 rows)

nymr=# select glterm from glossary where glterm > 'Driving Wheels' limit 1;  glterm
-------------Duty Fitter
(1 row)

nymr=# select glterm from glossary where glterm > 'Draw Bar' limit 1;    glterm
----------------Driving Wheels
(1 row)

nymr=# \d glossary                                   Table "glossary"Attribute |         Type          |
     Modifier
 
-----------+-----------------------+-----------------------------------------------------glid      | integer
  | not null default 
 
nextval('glossary_glid_seq'::text)glterm    | character varying(30) | not nullgldesc    | text                  |
Indices: glossary_pkey,        glossary_term_index

nymr=#

-- 
Gary Stainburn
This email does not contain private or confidential material as it
may be snooped on by interested government parties for unknown
and undisclosed purposes - Regulation of Investigatory Powers Act, 2000