Tags do not work sometime

Please go through this thread

You could see that tags ([code], [ quote], [b] etc) format certain posts, while they don't for certain others.
Is it some bug, or we've made some mistake while posting?

When you make a post, there is a checkbox near the bottom that says "Disable BB code in this message." If it's checked, then those tags are disabled and won't render properly. In the thread you point to, all the posts with broken tags have that box checked. I don't know why, but for some reason, that's the case.

Thanks Ernest.
My post was edited to enable BBCode.
It somehow checked that box by default, may be some testing was going on in the background.