I think something went wrong scaling several footprints of the symbols library. It's just impossible to choose a normal sized symbol for at least the KiCad-Logo, Polarity_Center and RoHS-Logo. Shown below are the smallest and biggest available polarity symbols.
Sizes are correct if measured for the height, but it's almost certain they were intended for the width, although it's hard to imagine somebody will ever benefit from symbols spanning 40 mm. Maybe it's better to skip those oversized symbols anyway.