I assume the photos show the bottom of the seam. Like the instructions say, the thread makes a complete revolution around the tension pulley, counter clockwise. The two halves of the tension are riveted together and the pulley spins in use unlike the Singer Tension discs which are stationary. Sometimes it necessary to adjust or clean lint the bobbin case though from your pics the lower tension is too tight or the upper too loose assuming the view is of the bottom.
Jon