Text comment with Thai language will be blur when move the comment box.

When I use text comment in Thai and move the box. Texts will be blur like it's not render after I move the box. But if I resize the box after I move it. That text will be normal again. I try to move English, Japanese, Chinese and Thai but another language except Thai has no problem.

I tried many language.

Only Thai will blur.

But after I resize the box it will get back.

How can I move the box and text will not blur?

Thank you in advance!