Problem: The user cannot remove himself from the observers. After updating the page, he is again listed as an observer. I didn't find any pattern. The bug appears sometimes. How can this be solved?
Workaround to stop watching individual issues with this problem:
This also worked using Bulk Change:
Welcome to the community !!
This seems to be a bug in few cases. I see some users have reported the same issue
When a user tries to edit the Watchers field when viewing an issue, the process never end and thus, the user is unable to edit it. This also manifests with being able to remove the watcher and seeing it successfully remove but upon hitting refresh the watcher is still on the issue.
One workaround is to delete these values (the association of this user from watching) directly from the database.
Full steps mentioned in https://confluence.atlassian.com/jirakb/unable-to-edit-watchers-for-an-issue-317948606.html