'Run over heel' is a problem that occurs where the foot rolls to one side. This can be caused by pronation of the foot. Injury such as collapsed arches can also cause this issue and some people are born this way.
'Run over heel' causes alignment issues in the feet as well as further up the body in the ankle, knee, hip, and back. Neat Feat have a number of products that can help with this issue such as the Walk Straights, Arch Cushions, Heel Cups and Maximum Foot Supports.