. @facebook app wasn't working smoothly for quite sometime now, start writing a comment on a friend's wall & it will behave weirdly.
So, thought may be its time to give a break to FB.
Hi Akhil. We first recommend updating to the latest version of the Facebook app. If you're still experiencing this when you try to post or comment on a friend's profile, learn how to report it to the team here: http://bit.ly/2K4PG5v . -KN