Singleton Overlaps?

I have two classes using as singletons.

class Boss {
    static let sharedInstance = Boss()
    private init() {} 

    var user_id : String?
    var username : String?
}



class Job {
    static let sharedInstance = Job()
    private init() {} 

    var job_id : String?
    var JobType : String?
}

But after populating the Boss.sharedInstance first, Job.sharedInstance also containing Boss' class variables. But after replacing the sharedInstance with other name (for eg. job_sharedInstance and boss_sharedInstance) respectively, things are working fine. It's quite weird. Can anybody explain me the reason why it would happen like this. Thanks in advance.

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