That means you can't draw a line onto a blade and then off again to the same spot but after the blade.

There are other avenues of drawing lines here.

You'll need to go around.

This may be the hardest of the three.

Think about the path your line takes.

This will be the hardest of the three if you forget something...

...a very important rule about the game you've learned early on.

You cannot draw a line over itself.

Since these three are related, it's recommended you solve the first symbol before this one.

Hints here will assume you have.

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Notice that the three symbols on this face look very similar.

As with the first symbol, you'll be tracing lines on the spinning windmill.

Start drawing from the middle and go partway down the first blade.

Wait for the blade to connect with the orange paint on the right of the door and draw onto there.

Go down and wait for the next blade. Ride this blade all the way around and get off onto the orange paint that's to the left of the door.

The third blade (with the broken tip) is your destination. Wait for it to arrive and the finish by drawing toward the centre on that blade.

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Note that this symbol makes a circular half turn.

To make a half turn, you need to draw the line past the second blade.

No, the game is not bugged.