The contestant who is mainly responsible for task to get cancelled

is none other than the great Mr Paras Chabbra

All the tasks that got cancelled in this season, were mainly because of Paras, but blame went on someone else.

Teddy bear task, it was Mr Paras who started rejected teddies for silly reasons, and that's when Shukla team also started doing that.

In snake n ladder task, everyone was playing peacefully n minding their own business but then Mr Paras decided to ruin Shukla's ladder and that's when everyone started doing it and some get really OTT. 

Paras knows Shukla team has some serious temper issues so he took advantage of that.

All these the base was always set by Paras. Yesterday's task he was calm that's why that task got completed.