The sounds are duplicated when you kill any mobs or when you fall and get hurt from any height.
Linked issues
duplicates 1
Attachments
Comments 2
migrated
[media]
Thank you for your report! This issue was, however, reported at an earlier time as MCPE-8170. Feel free to add any information you find relevant in the comment section there.
If you did not do so this time, please perform a search to see if your bug has already been submitted prior to creating new tickets in the future.