Mob generation problem

Hi

I have a problem, I created 2 mobs and set up their generation, it worked fine. But when I created more than 2 mobs, the generation of the mobs I created was disrupted, namely, someone is not generated, and if generated, ignores the Minimum and Max group size parameter and generation occurs 1-2 mobs instead of those assigned in the parameters. I pressed the code regeneration button, but it didn't help, I didn't find anything on the Internet either. No errors are displayed in the code. Anyone help me please with this =(