Ya there is some inconsistency which is more Haseeb's fault than Wahaj's .
Given performance issues are not limited to one actor, Haseeb is also very much at fault. Even a seasoned actress like Saba Hameed was so one-tone giddy and OTT (to the point that it feels like she is more interested in BA). When so many otherwise astute performers who have delivered more nuanced and layered performances in other shows all of a sudden get so one-tone or veers from the character & situation, iska matlab hai Haseeb is either giving them some bad brief or, at the very least not correcting them. Actors ki bhi responsibility hai, but we do not know if, behind the scenes, actors raised these points or not.
So, either this was an old script that KRQ delivered under that old contract, or if it's a new one, KRQ decided teach Kaddu a lesson for suspending his contract back then.

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