Italics Disappear - 1.5.7.0

I’ve been opening, updating and closing the same document with not much problem but recently the italics have all disappeared (text now appear normal) from the document. I’m not sure if its because I just had it compiled, and compilation is the the problem that caused the italics to disappear. Now I have to re-italics all of them, but wondering if the same problem happen and I have to re-do and re-do.

I’ve read some cases here that cut and paste would have that problem-lost of formatting-but I didn’t do any cut and paste, all along been working on scrivener only. I see my BOLD still intact, only italics disappeared.