I did some research and found one reason this may happen is because of rushing the first pull, pulling too fast off the floor...Does anyone know of another possible reason there may be a hitch in the pull and how to correct?
Yes, you see many others do it too.It's why many go w/ a wider foot stance than used to be the norm, since the feet don't jump out as much as w/ the triple-joint-extension.Like I said, it really sends you down as the bar goes up -- works for power SN w/ lighter wt, but much more conducive for full SN.It does have a slight tendency to kick the bar fwd, but you can correct that before long.
Both Ryan and Dave make very good points.I would add that it may help to watch vid of the Chinese, Georgian, and other top lifters who ENGAGE their hip thrust in a way that BOTH...... kicks the barbell upward and the body downward.THAT'S what makes a full SN.I have been amazed by the results of my re-education on this point of tech (in the last 2 mo) after more than 2 decades of enjoying this sport.Such action is the HEART of quickness.I have also been getting great effect from the kind of hip-loading that Kolecki is such a great example of.