Ore generation changes automatically

I adjust the ore settings in MCreator, but when I say "Save mod element" it changes automatically.

My settings: 

Avarage amount of ore groups per chunk: 1

Avarage number of ores in a group: 8

Minimal generation height: 1

Maximal generation height: 16

automatically changing settings:

Avarage amount of ore groups per chunk: 10

Avarage number of ores in a group: 16

Minimal generation height: 0

Maximal generation height: 16