Continuous birth control and spotting

The breakthrough bleeding is probably due to you not taking the placeno pills. Taking the placebo pills allowes your hormone levels to decrease which gives you a period and then the uterine lining sheds and thins out.

By taking the hormones continueously without taking the placebo means that the uterine lining builds up without shedding so that's when you experience the breakthrough bleeding.

I would suggest that you continue with the current pack and when you reach the end of the current pack, you take the placebo pills all 7 of them and then start a new pack once all the placebo pills have been taken.
This will allow the uterine lining to break down and you shouldn't expereince the breakthrough bleeding again unless you take the active pills without having a break.