I think you're looking at it from the wrong frame of reference.

Technically, time is still moving forward. Time has not moved backwards on a universal scale, you have just traveled in such a way that you arrived at a point in time where your temporal reference frame is different than the rest of the time you are currently occupying.

Your causality has remained uninterrupted by traveling faster than the speed of light.

Traveling faster than the speed of light means that you have exited the universe and re-entered it at a different point.

At the point that your causality reintegrates with the current temporal causality that you find yourself in then a new causality is created.

Once again, this does not alter causality.

You've just put a stitch in time.