Normal-scaler not working as expected

Applying the Normal-scaler mutliple times on a already normal distribution is bahaving not as expected:

Using the Sklear standardScaler, we can see as a reference how it should be:

I also am really unsure why our tests are not capturing this. So there are multiple work items here:

• Fix the loader
• Investigate why this is not caught by our tests
• Fix / extend the tests