It happens all the time,I posted a pic where it arrived ngp at 00:25,and stood on pf 5 for 1.5 hrs.
I've noticed during night time most Raipur bound trains arrive before due to extra timing and fast passenger traffic. This slot trains along with pune hatia exp,Samta,chattisgarh exp,all of them comes 20-30 before.good thing is that traffic is less during the night time at ngp station.