Regarding Tamil Spell Checking

Hai
 	I am having one tamil document in unicode. When I try to 
check spelling through kword or kedit by using aspell,it is identifying 
the misspelled words correctly. But it is highlighting in different place 
not in original misspelled word except if the misspelled word is the first 
word of the line.

 	I am using two tamil dictionaries(one is downloaded from net and 
another one is created by me).

 	What will be the reason for this problem?

Expecting your valueable response.

With Regards,

("\''/").__..-''"`-....         M.Kasirajan,
  `9_ 9  )   `-. (    ).`-._.`)  Project Associate,
  (_Y_.)' ._   ) `._`.  " -.-'   DON Lab,CS Department,
   _..`-'_..-_/_/-'_.'           IIT Madras,
(l)-'' ((i).' ((!.'             Chennai-36.