That's becoz of current reservation. Upar wala jo SS hai wo 1st charting k baad ka ha. 1st chart ban ne k baad current open hota ha, ab current ma kuch aur extra bookings to milti hi ha jiske lia 1st chart ma jitna pass show hota ha reality ma us se thoda jyada hota ha. But 1st charting ma IRCTC ma jo data hota ha wo sahi hi rehta ha bas 2nd charting ma avi Irctc ma 1st charting k jese seat wise data ni deta islia current reservation wale passenger count ni hote ha