The sprite header pane containing the rotation style buttons.
Due to the default rotation style, sprites rotating will appear upside-down. You can change the rotation style of a sprite by selecting it and using the buttons that appear when clicking on the direction input in the header of the Sprite Pane. "Left-right" is most likely the best for this.

There is also a block to change the rotation style dynamically: Set Rotation Style ().

This block can be used instead of the buttons to change the rotation style.