Rishabh as you are told, there is an error in the NRR calculation. If the batting team gets all out within the alloted overs then the NRR will be calculated for entire 50 overs and not for the number of overs they played.
Example: In Kenya's match against New Zealand, Kenya batted first and were all out for 160 in 21.4 overs and the New Zealand were all out for 140 in 20.5 overs
SO the NRR for Kenya should be
=(160/50) - (140/50)
= +0.40
But you have updated as +4.58. Can you please check your formula for NRR once again