I created a small project that shows a brownian being used to spawn some hearts. They are moving pretts slowly, but when you move from frame 19 to frame 20 one of the hearts does a sudden change in positions while all other move smoothly. This happens again moving from frame 82 to frame 83.
Also, on frame 81 the upper right heart has some pixel smearing... which is not nice... but I can clean that up manually.