Induction cookware not working with some induction cookers
I have experienced something very similar, and it was because the pot was too small in diameter, so was not being sensed by the hob (range top).  Higher end, professional induction hobs do not turn off as easily if the pot is pulled away for a second.  Cheaper ones I have seen are almost on a hair trigger.  So if your pot is small, and not perfectly centered, the sensor will trip and the range will shut off.