iOS Core data: Fetching more objects than saved - ios

Question

I am new to Core Data, and I am trying to use it for saving users. However, when I first create a user it inserts the user. This seems to go fine. It is only called once.
-(void)insertUser: (User *) user{
[self userToModel:user];
NSError *error = nil;
if(![context save:&error]){
NSLog(#"Unable to save managed object context");
}
}
-(UserModel *)userToModel:(User *) user{
UserModel *usermodel = [NSEntityDescription
insertNewObjectForEntityForName:#"UserModel"
inManagedObjectContext:context];
[usermodel setValue:user.username forKey:#"username"];
[usermodel setValue:user.password forKey:#"password"];
[usermodel setValue:user.sessionid forKey:#"sessionid"];
[usermodel setValue:[NSNumber numberWithBool:TRUE] forKey:#"selected"];
[usermodel setValue:[NSNumber numberWithBool:user.beta] forKey:#"beta"];
return usermodel;
}
Next, I am fetching the users and it is returning 3 users: 2 exact similar Users, and one nil model.
-(NSMutableArray *)getUsers{
NSFetchRequest *fetchRequest = [[NSFetchRequest alloc] init];
NSEntityDescription *entity = [NSEntityDescription entityForName:#"UserModel"
inManagedObjectContext:context];
NSError *error;
[fetchRequest setEntity:entity];
NSArray *usermodels= [context executeFetchRequest:fetchRequest error:&error];
NSMutableArray *users = [[NSMutableArray alloc] init];
for(UserModel *userModel in usermodels){
User *user = [self userModelToUser:userModel];
[users addObject:user];
}
return users;
}
UserModelToUser:
-(User *)userModelToUser:(UserModel *)usermodel{
User *user = [[User alloc]initWithUsername:usermodel.username
Password:usermodel.password
CSRFToken:usermodel.csrftoken
sessionid:usermodel.sessionid
Beta:[usermodel.beta boolValue]
Selected:[usermodel.selected boolValue]];
return user;
}
SelectUser
-(void)selectUser: (User *)userToSelect OldUser:(User *)oldSelectedUser{
UserModel *oldSelectedUserModel = [self userToModel:oldSelectedUser];
UserModel *newSelectedUsermodel = [self userToModel:userToSelect];
[oldSelectedUserModel setValue:[NSNumber numberWithBool:FALSE] forKey:#"selected"];
[newSelectedUsermodel setValue:[NSNumber numberWithBool:TRUE] forKey:#"selected"];
NSError *saveError;
if (![context save:&saveError]) {
NSLog(#"Changing users failed %#", saveError);
}
}
I already tried to reinstall the app to make sure no old users are still saved or anything. Can anyone help me?