Why won’t audio play through headphones?

My daughter has had this tablet about 8 months now. The audio and everything else on this tablet works fine, except when you plug in any headphones. At first I thought it was the headphones, but when replaced the issue still consisted. When plugging in headphones, there are rapid dull clicking sounds (I’m not sure how else to explain it) coming from the external speaker and no sound through the headphones themselves. Once they are unplugged, the sounds stop. I have tried searching for an answer or a solution and cannot find anything on what I’m experiencing.