In Team managed projects, the workflow is part of the project, so changes to a TM workflow will not affect other projects.
Company managed projects don't contain workflows, they use ones gathered from a global shared list, so if you are looking at a project, go to admin -> workflows and edit a workflow, you could be editing a workflow which is in use by many projects.
I suspect that is what has happened to you.
When you edit a workflow though, you work on a "draft" and when you commit your changes to it, Jira asks if you are sure, and if you want to create a backup. Your administrator should really have created a backup, so you could migrate back to that. Go to Admin -> Workflows, scroll to the bottom of the list and expand the "inactive workflows" section.
The other thing that could have happened is that they edited a status name. Status is, again, a global and shared object. Many workflows could be using it, so an edit could affect many places. There's no backup of status, but all you'll need to do is edit it back to what it was.
You must be a registered user to add a comment. If you've already registered, sign in. Otherwise, register and sign in.