Not able to reply

I am trying to reply a person on my own created topic named as problem in view pager. But I am not able to reply this pop-up is appearing.

Read the message… Please wait before others to participate… If you want to add more information on question just edit it…
Or refresh the page

Two users are already there you and @yusufcihan and I am trying to reply Yusuf

I’m not replying to anyone for now. Did you try again? Also Discourse allows to write a reply with anyone at same time.

Many time on different browsers