Lead School Software Development Engineer In Test (SDET) III interview questions

Initially, 2 rounds of technical interviews happened and I got a call for salary expectations. They have low budget for the profile and then they have decided to take 2 more technical rounds. As per my experience, all the technical interviews went well then I got an email with rejection status from consultant and the reason mentioned was the lacking mobile automation skills, That's strange because I have never mentioned or written in my resume that I worked on mobile automation. They still took my interview and now this reason after 4-5 rounds of interview. That is quite unexpected.