Via Science interview question

The initial interview was with an external consultant, asked basic experience based question on qualifications. Second was with the hiring manager (the late night interview) it was conversational and pleasant. The 3rd was with 2 “peers” seemed Junior, softball questions and I stumped them a few times with my follow-up questions. Not what I would have expected for a senior role. I am not used to junior team members being involved in senior talent hiring processes.