GenScript Legal Counsel interview questions

There were four rounds of interviews, and the first three rounds were okay, even though they asked to prepare a PPT at the third round. Interviewers based in the EU and the US are nice and know how to respect people. However, at the third interview, the man who will be my line manager only asked me one question but people from different departments asked me so many, which does not make sense to me. After that the HQ HR added my number to have unexpected fourth interview and asked me some questions not related to work, like do I have kid or am I single, those disrespectful and ridiculous questions. It is NOT professional and respectfull AT ALL! and she also attempted to confirm whether I am willing to work overtime. I would say, there are so many red flags within the company.