Mcreator vanilla mob spawn issue?

Made a few custom creatures for my own modpack, after playing for a while, i noticed that some of my mobs multiplied like crazy, they spawned as far i could see, 100++ 

So i reduced the spawn weight, and the min and max spawn groups. However, i was flying over the jingle in creative, and i noticed that Ocelots started spawning in the same manner. Ocelots's everywhere, several hundred.

Does Mcreator somehow turbocharge vanilla  mobs spawn weight?