As the two images below shows, I have four equal stationary spot lights (only difference are light intensities, and I have checked that this is not the culprit) shining light down towards the boxing mat. On the mat itself, the ropes are casting shadows of different intensities. The bottom and left side shadows are stronger than the top and right side.
This can also be seen on the shadows of the red and blue characters. Their top and right side shadows are fine, but the bottom shadow is barely visible, and the left side does not cast a shadow at all.
Could I be doing something wrong or missing some kind of setting?