Same as Samba_Diop reported, I also had problem to edit the confluence page.
There is a known problem, see https://confluence.status.atlassian.com/incidents/dvfrm6fr4c0k for follow-ups.
I've got the same problem on 2 of my pages just now.
You must be a registered user to add a comment. If you've already registered, sign in. Otherwise, register and sign in.
You must be a registered user to add a comment. If you've already registered, sign in. Otherwise, register and sign in.