Maytage Washer Leaks

My washer only leaks when it is set to Large or Extra Large load. When it leaks, it appears to be coming from the bottom of the tub near the spindle. It will leak with the tub standing still without any motor actions running. It does not leak on any other level setting.

What is the possible cause of the leak?

Why does it only leak on levels above Meduim Load?

Thank you.