What is the difference of these two users?

[Mela]

What is the difference between these two users? I am trying to deactivate the user named JiraHead 4 but I can't because it shows the Suggest Change instead of Update details.

To Deactivate the user you must click the Update details > Deactivate. But the other accounts don't have the Update details but it shows Suggest Change instead. What id the difference?

Please see the image below

[Lucas Modzelewski _Lumo_]

Regardless of account type, you can always 'revoke site access' from the users listing:

or from user details page:

[Nic Brough -Adaptavist-]

That looks to me like JA and J are two different types of user - JA is managed inside Jira and J in an external directory (hence the "suggest changes" - you'll need an admin of the external directory to make changes, so this lets you suggest it to them directly)