Detected leak number changes for the same APK analysis

[gaojun0816]

As shown in the image, I ran the analysis with the same APK and parameters 4 times and the leak number changes every time! Is this normal? I used the latest release 2.8 got from GitHub!

UPDATE: I further tried with release version 2.6.1, 2.7 and 2.7.1 with several different APKs. They all performed the same!