1. Given the context of the story you just gave, it can easily be misconstrued.
2. Did anything change after changing the headphone? So, what changed?
3. Your hair grew long? So, how long is it? Does it reach your shoulders?
headphone は単数です。 shoulders (肩は複数です)。
1. When it is the flow of your present speech, there is no help for it even if I misunderstand it.
2. You changed the headphones and did it turn into something? Therefore what changed?
3. Though your hair seems to have grown, how long is it now? To a shoulder?
1. Judging from your story, it is no wonder misunderstanding happened.
2. Did anything change after you changed the headphones? What changed?
3. Your hair has grown long? How long is it? Does it reach your shoulder?