Azure Durable functions : Activity functions are getting retriggered during parallel execution

Question

I have a requirement where I need to process records from excel. I am using durable functions.Orchestrator client is blob trigger. The Orchestrator function will read blob and trigger activity function asynchronously.Problem that I am facing is activity function is getting re-trigger for few records. Also , it is not processing all of the records.

For example , in excel sheet ,if I have 100 rows , then activity function is getting triggered only 80 times (15 are repeats). Below is the code snippet for Orchestrator function. I have binded blob to orchestrator which is not recommended as per documentation. Is the reason it is causing issue. I am new to Azure and I currently exploring.

    [FunctionName("OrchestrationFunction")]
    public async Task RunOrchestrator(
        [OrchestrationTrigger] IDurableOrchestrationContext context,
       [Blob("input")] CloudBlobContainer container,
        ILogger log)
    {

        log.LogInformation($"Orchestrator triggered : @{DateTime.UtcNow}");

        try
        {
            var accountsProcessing = new List<Task>();
            var blobName = context.GetInput<string>();
            var blobReference = container.GetBlockBlobReference(blobName);

            using var stream = blobReference.OpenRead();
            using StreamReader reader = new StreamReader(stream);

            //Skip first Line as it is header
            reader.ReadLine();
            var currentLine = string.Empty;
            while ((currentLine = reader.ReadLine()) != null)
            {
                if (!context.IsReplaying)
                {
                    log.LogInformation($"Data to process : {currentLine}");
                    Task accountProcess = context.CallActivityAsync<Task>("ProcessRequest",currentLine);
                    accountsProcessing.Add(accountProcess);
                }
            }

            await Task.WhenAll(accountsProcessing);
        }
        catch (Exception e)
        {
            log.LogError($"Exception caught while processing orchestration {e.Message}");
        }

    }
}