this will happen to all Nokia phone.
your phone book have 2 same number with different contact name.
so what u do now is, use the search app at <Internet><Search><key in the number>
if you found both contact sharing the same number, delete one of them and ur sms inbox will be fine again.

pls send me a mail and let me know it works or not.
hope my advice will help.

so far so good with v50. love the music play.

for me i said V50 Good, No laggy, smooth scoring on home screen contact, no hard reset at all.
JUST DO IT.

is ur quickoffice free or u need to pay at OVI store?