Meta Software Developer interview questions

Contacted by a recruiter, then scheduled a phone interview (2 questions leetcode easy-medium on coderpad). Moved to onsite but they asked me to make the 2 whiteboard code questions remotely. Passed the first-one, rejected after the second-one (even if my solution was O(n) and looking online it was used by other candidates that were given an offer). I feel that the interviewer was looking to a particular solution and if you don't find it you're rejected