Async and await suddenly stopped working

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C#5.0

I am working in mvc 5 with entity frame work from last one years i created many separate async services before its working fine but now i dont know why its suddenly stopped working? when ever i try to fetch the data from data base through repository its give me the wrong data for some column when i go to database table and checking the column values its fine but in service some column values are not correct.can any one help me why this happens????

see one my function in my service this is sample code.

public async Task<bool> Assign(hs_Program_Assignment programAssignment)
        {

            programAssignment.HPA_AssignedByID = CurrentUserId;
            programAssignment.HPA_DateAssigned = DateTime.Now;
            programAssignment.HPA_Source = ModuleSource.Activity;
            var Program = clientUnitOfWork.ProgramRepository.GetByID(programAssignment.HPA_SourceID);

}

What I have tried:

i am using task.run() and task.factory but still having the same issue.