Failing in Automatic Completion of a number while dialing a number

[AC Question]

when i dial a digit of a telephone number in my Samsung phone it does not list the numbers (from my contact)
For example say I type " 3" in my dial pad usually a list of telephone numbers with 3 shows up. But now instead when I type the digit "3" a list with contact names with the letter "E" shows up. I can't understand y? Pls help.