My Canada study visa was approved but those of my dependent children were cancelled because I chose visit instead of study for the children. How do I reapply for them without duplicating my own which has been approved (onlibe) because that of the principal applicant has been approved.

Why did my Canada student application was approved but those of my dependent children were cancelled. The message reads “Your application was cancelled. We will send you a message soon” What do I do? The visa category applied for them is visit.