I don't know Khmer so I can't figure whats wrong. As I see on your images in some cases where are spaces and in some cases where aren't. If you mean these spaces - I can explain why they are show... This isn't bug - its feature. The JComments has feature that allows to insert breaks into long words to prevent template broke. You could disable this feature in JComments settings (check Restrictions tab).
Thanks,
Break up words with more letters than: 1000
Then the problem was solved.