Hi David sorry I am a bit late replying. I tried with my manual switched remote and it worked exactly the same as you, ie press and the shot is taken with the flash firing.
Tried again with the wireless remote and needed two presses to fire the flash as before.
After a bit of thought I started wondering about the pulse length so I tried a very brief press using my manual switched remote , and would you beleive it I needed to press again to take the shot first fast press set the focus etc and second fast press takes the shot!
So this leads me to believe that the wireless remote pulse is actually too short to allow the camera to focus and set the the flash before the shot is taken.
Any thoughts,
Bryce