Som Q. on Dragy and 0-60 mph. expert adv needed. (SeeVideo)

[conv90]

I have Dragy. I like it and I believe on the recorded times on 0-60mph or 0-100km/h.
But when I use it on Camera mode to overlay the video, I can see (ONLY on playing the video) a sorta like Christmas tree.
I can't see it while I start to record the movie on the phone.
In addition (the main concerrn) I see that the chrono starts ONLY when the green dots ends. But the car started to move way BEFORE the chrono starts. The chrono starts at least a full second before.
And It can't be the 1ft staging because the car moved at least 20 to 30 ft.
I tried to wait befor to start or start as soon as posible, but at the end the Chrono starts always much more time after I move with the car.

I'm wrong on something?
You can clearly see here:

 

[1.21GW]

It appears the time is still correct despite the visual lag. I agree, it seems strange though.

 

[conv90]

Yes time is correct (I made also a 4.27 secs with 4.01 1 foot roll). But it seems not only a LAG. Because the video ends to 4.36 in the correct point where the speed is 60 mph but it starts when at 4 or 5 mph.