It could be the positioning of the where your foot is on the pedal. My husband had an issue with the first set of clipless pedals he tried. He had a lot of issues with his feet. Bought another set, different style and he hasn't had any issues with those. So that could be part of it. I haven't had real issues that way, just a semi fear of having my right foot clipped in so I use the type that has clipless on one side and platform on the other.