I have the same issue, as does another rider I spoke to with the same pedals. I think because of the shape of the pedal and where the weight on it sits, it tends to flip upside down (drives me nuts too!). I've gotten in the habit of sticking the toe of my shoe into the depression on the underside and using that to get a quick pedal in, then sort of scooping my foot under the pedal to flip it around and (if all goes well) clip it in quickly.

Of course, this doesn't always work as well as planned, but if thinks start getting dodgy I just do the toe pedal thing a couple more times quickly so I can try the process again.

K.