Thank you guys in advance for your responds.

I've bought a pair of speed play x2 pedals from e-bay site. It described as a good condition but also said the cleats may need to be replaced in future. But still they have a lot of mile to go. My question is that I've been fallen three to 4x and my right foot cleat didn’t uncleat itself when I fell. I normally uncleat my left side when I'm going to stop. Some time I do both feet. I have injured my right knee and ouch, my new bike from these falls. How ever it happened when I get to stop in intersections which I begin in advance uncleat my foot most of the times . When I begin to stop, I lean to the right when I stop some times. The Wright foot cleat make me fall and my foot stays cleat till I undo my shoe and take my foot out. And embossing enough from the falls. Then I uncleat the shoe while I’m lying under my bike. Do I have a bad right side cleat or there is something else I don't do Wright?