I think it's so that GauriKa's relationship remains stagnant (if they did a 3 month leap they would have to show the GauriKa are content or tolerating one another atleast even if they had flashbacks) they've been clever by putting Om in a coma as Ishqbaaaz gets to move forward while DBO remains in the same place despite them now having the same time frame.
Hopefully I'm making sense 😆
-Sam 😳