Korean input errors

Korean input errors

Hello All, 

I'm having trouble while writing emails in Korean.

Each syllable seems to replace each other, leaving me with the last letter as the only input letter. 

e.g) If I were to write "ABC" in that order > the A blinks and is replaced by B, and B is subsequently replaced by C, leaving me with C as the only letter written.

Alphabet input seems to be free of this problem. 

Any help is much appreciated, 
Jiyoon