eBay interview questions

Got an interview at the campus recruiting event. Passed the interview. Then talked to the HR on a phone call. Then passed a skype interview with a product manager, and finally failed at the second Skype interview with a senior product manager. No behaviorals, surprisingly. The first Skype interview asked about resume and basic pm questions. The second Skype interview was intense on PM questions, like what do you think of this eBay product, why was it designed that way, how would you improve it. Also got asked if I know any machine learning algorithm.

I got employee referral and was called for first technicaln phone scree round. Interview asked me questions from leetcode. was fairly simple but with a lot of cross questions for the solution i provided