Hi, guys!
I've created a "Retrieve" button in my object to return the Status value to the one before the one I am right now.

For example:
Status: Returned - Open - Starting - Writing - Completing - Closed
If I am at Writing and I need to go to the Returned, I'd like to go back to Writing after that just clicking the button.
It's working, the problem is that sometimes it updates to the Starting for example.
I can't understand why this happens and why this happens only sometimes. 
It is not a problem of permission or session, because I'm testing with Admin 

My code:
@AuraEnabled    
    public static String updateRecordAfterReturned(Id recordId){
        if (bankaccRcd == null){
            bankaccRcd = [SELECT Id, Status__c, Observations__c FROM Bank_Account_Request__c WHere Id =: recordId];    
        }
        try {
            List<Bank_Account_Request__History> bar = new List<Bank_Account_Request__History>();
            bar = [SELECT ParentId, OldValue, NewValue, Field, CreatedById, CreatedDate FROM Bank_Account_Request__History 
                   WHERE ParentId = :recordId and Field = 'Status__c' LIMIT 1]; 
            bankaccRcd.Status__c = String.valueOf(bar[0].OldValue);
            update bankaccRcd;    
            return 'Success';
        }catch (DmlException e){
            Return 'Error: '+e.getMessage();
        }
        
    }