korean typing bug ? (backspace/spacebar)

Hi I'm a korean user and I type in korean words to my work in adobe illustrator. 

1. Whenever I have to erase one korean sylable such as 'o' it makes me press the backspace button twice. 

2. I cant explain this error in a specific term because it happens occationally and in random situation whenever I'm trying to write a long paragraph or just go through my sentences and fix some errors. If I press my spacebar, the last one word I typed in just appears and makes me erase it once again.