Here is news related to this
Someone called off a Rs. 300 crore deal with Varun Dhawan and we know who they are : Bollywood News - Bollywood Hungama
I think it must have been cancelled bcoz some movies might have been kept out of agreement which broadcaster would have raised objections to. Remember YRF movies of Salman never came on Star India despite exclusive deal with him.
Also i m not sure if it was Zee or Star which entered pact with Varun Dhawan as few articles state that Judwaa 2 was the movie kept out but we know it still rests with Star India. Also Kalank is with Star India... This is most likely bcoz of Fox Star being producers. Above information indicates it was actually Zee which might have been partnered with Zee but cancelled later on
Also Star India will get upcoming movies from Dharma, Vinod Chopra Productions too as Fox Star is co producing them. If movie is produced by multiple players then rights r sold separately even though one of the 2 producers might have agreement with specific channel. Also Movie Stars have to buy rights themselves to be able to hand it over to their partners hence sometimes certain production companies do not indulge in this as their own satellite tv partners stand to lose