App Rating suddenly decreased in a week.

After the new release that had a crash fix, we found our app rating increased overnight. We have a screenshots that reflect the same:

screenshot as of 22/10/19.


screenshot on 23/10/19.


And in another week, we found that the ratings decreased again:

screenshot on 30/10/19.


We did not reset the ratings while submitting the new build. Unable to understand the sudden increase and decrease in the app ratings. Can someone explain?