I have an Apex class that returns a SOQL Set List, where it is display by VF page.

I even tried setting the "Enable Profile Access for Apex Class", and enabling that profile the non System Administrator profile, still till I get nothing.

The data is only showing if I change the profile of that user to a "System Administrator", but  not for users who are not of System Administrator  profile.

below is my code if it helps, let me know:

private final string UserID = UserInfo.getUserId();
private List<ProcessInstance> ProcessInstanceID  {get; set;}
public String getUserID() {return UserID;}

        public ItemsToApproveFF(){  
        
        }

        public List<Financial_Form__c> getFFData() {
        Set<ID> getID = new Set<Id>();
                
                for(ProcessInstance a : getProcessInstance()){
                        getID.add(a.TargetObjectId);
                }

                
                List<Financial__c> FFData = [SELECT getReceiptDocLink__c, Name, Company__c, Form_Type_del__c 
                                    FROM Financial__c
                                        Where Id IN :getID];

             return FFData;
        }
          
        public List<ProcessInstance> getProcessInstance() {
           ProcessInstanceID = [SELECT TargetObjectId 
                                    FROM ProcessInstance 
                                        Where Id IN (SELECT ProcessInstanceId 
                                                        FROM ProcessInstanceWorkitem 
                                                            Where ActorId = :UserID)];
           return ProcessInstanceID;
        }