I guess you need to instruct tableau to start your week from Monday. By default, in tableau week starts from Sunday.
Set the default week start like this
Or you can right click on your date field from data pane do the same as above.
Once done then check the count. Let us know if this work.
Thanks for your reply, I have already done this, its not working. I have attached the twbx.
Try to reduce the workbook size. I don't download workbook >5MB
Iam not sure, its a extract so I cannot reduce it