Bitso Senior Software Engineer interview questions

I applied for an open senior software engineer position through LinkedIn and then a recruiter contacted me to start the process. I had 4 interviews: the first with the recruiter to explain the whole process and the job, the second with one of their engineering managers, the third one was a technical interview with 2 very friendly engineers and the fourth one was the final interview with one of the company's heads. After each interview I would get an email from the recruiter stating that I did really well and they'd like me to advance to the next step. This happened until the last interview with the head, after which I received a vague email stating that they would not proceed with my candidacy with no specific reason whatsoever. I replied back asking for a more specific feedback on the decision, since it was obvious to me that the last interview played a role in the decision, but the recruiter didn't care to reply to my email. What's weird is that the last interview was mostly a situational interview, so to have a "you did really well" reply for each interview made for then to be dismissed and ghosted after a situational interview at the end, is really bonkers.