Curls have changed since my haircut?

My hair is naturally jet black and curly (to my waist b/w 3a and 3b). On friday I went to a salon and had my hair layered and highlighted for my convocation. Now my hair is medium length and I find that the curls are very loose to you suspect it's because of the hair dye...or the cut? Perhaps both? When I first got home I washed it 3 times and while my hair was wet it was extremely curly however afterward it would get loosely curled! Any ideas or suggestions? I want my curls back!!! :sad: