If 2 or more people are working on same page under confulence. The text is getting merged. What can be the resaon behind this.

[Nic Brough -Adaptavist-]

It's trying to avoid losing the edits made by both users.  Merging what they are doing is the best option at present.

Last year, Atlassian demonstrated a basic dynamic collaboration on a page, so that you can see other people actively editing it, but we don't have a firm timeline for when that will be available.