Disney/hulu withdraws offer

I cleared 7 rounds of interviews for a senior SDET role(I was approached on linkedin by recruiter with the sr. sdet role mentioned in description). The recruiter confirms on Friday that offer will be extended and today she reached out saying as you interviewed for a junior role and you have 11.5 yrs of experience and it is not matching for a junior role, the offer will not be extended now. How can a sr SDET be a jr role? Not sure what to do now. I was really looking forward to the offer after spending 7 hours of time in the interviews. Feels a bit unprofessional.