Hi Terraromaster,
Welcome to our community! 
The Transform values are always relative to the parent game object. Always make sure that the parent has got the same numbers in the 3 scale fields: (x, x, x) where x is a positive float value. Otherwise, if you rotate the game object, the children get distorted.
If you need different values, the fastest solution is to move the mesh to a child game object, scale the child as you wish, and leave the parent alone. If you rotate the unmodified parent, the child won’t get distorted.
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