FXML TextField: Weird behaviour

I used a sample from MacOs bundle - FXML-LoginDemo. And I noticed some weird behavior of text field.
Steps to reproduce:
1. Click on the empty text field (to put focus in it)
2. Press "A"
3. Press "S"
4. Release "A"
5. Release "S"

This leads to all "as" and all further typed characters being shifted to the left, like the component decides that it's right border == left border.