Many factors were into play. The increased number of people sitting the exam, (due to covid many students decided to sit the ucat because of the lack of travel or work), the difficulty of the 3 exam papers and also how well the cohort performed overall. It was also the second year of the UCAT meaning there are several people who had experience in the first year and scored higher in their second year.
None of us here can predict how the scores will shift this year. Like
2xq said, chill out and wait for either preliminary or official results. This may seem difficult but focus your mind on other things that you have control over (atar/gpa, interview skills etc). Congrats on your score too!