By default, users will get email updates for issue activity when:
To disable this you need to remove Current Assignee value from Issue update event.
Go to Project Settings > Notifications
Please refer below documentation for more details on this.
There may be the case that default assigne has been set to project lead and if you are project lead, you may have assigned issue.
To check this,
Go Project Settings > Users & Roles > Default assigne > change to unassigned
Also if you are part of Componet lead and default assignee set to Componet lead, you may see that issue are assigned to you based on component value.
Go Project Settings > Components
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