Difference in wording in narrations

It was mentioned in a previous post clarifying a report by anas ibn malik ra in sunan al kubra al beyhaqi 2/320 that the slave girls of umar ra were serving with their hair uncovered and hitting their breasts and the confusion arose from the word تَضْرِبُ which was used to denote "strikes or hits" however this narration was reworded to تَضْطَرِبُ which denotes "shakes" changing the meaning to "serving with their hair uncovered and breasts shaking" in Book of Knowledge of Sunnah and Athar 3/146 (4071) authored by beyhaqi as well. What accounts for the difference in wording and which is the correct narration? initial post in question: https://islam.stackexchange.com/questions/79569/umar-and-sex-slaves-hadiths Narrations: https://shamela.ws/book/2863/1247 and https://shamela.ws/book/7861/3655