It's happening more and more because interviewers are asking these questions. They are looking for a nice story where I had conflict with my manager I used STA

It's happening more and more because interviewers are asking these questions. They are looking for a nice story where I had conflict with my manager I used STAR to solve it and everybody was happy. So interviewees have to prepare such stories, remember the details and adjust things to make them look good. Because saying "I don't really remember anything like that happening recently to me" or "We sat in stunned silence for a minute and went on with the meeting" doesn't cut it during interviews. Maybe managers ask these "personal conflict" questions so much because that is a bigger part of their job. But for ICs (mostly anyway) they are pretty uncommon.