Landscape Scale change in PIE

Development World Creation
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1

Hello,

I add a Landscape through the Editor (Landscape mode > Create New).
Then I select it in the Outliner and look at the Details, I can see that the Transform > Scale is set to (100, 100, 100) (default value when using Landscape mode > New).

However, if I Play In Editor, select my Landscape in the Outliner and look at the Details, Transform > Scale is now (128, 128, 256).

Where does this change come from ?
I started from a new C++ ThirdPerson Project and a new Basic Level.

Thanks in advance !