My friends minecraft account is broken

  • me and my friends have an aternos server where we all play together and it was going well , no bugs nor glitch. then we wanted to update our server to the latest version which is 1.18 and so we did. but one of my friend have an issue with their account. whenver they hit a mob it would make a weird noise, ex. if they hit me it will sound like that their hitting a pig .the items on their screen also look diffrent. ex on their screen it looks like they have a trident but on my screen its a phantom membrane.

    we tried many diffrent things to fix this , we tried deleting her player file , restarting minecraft , restrating the server but nothing work . does anyone know how to fix this?