MyGUI log spam when post processing HUD is open

I'm seeing this warning in more than 100 lines for some reason:

21:43:26  |  Core  |  Warning  |  Widget 'Label|AutoSizedTextBox' have unknown property 'Padding'  []  |  /mygui-prefix/src/mygui/MyGUIEngine/src/MyGUI_Widget.cpp  |  1208