Hello and welcome to JA! Let get you some answers.
Yes it is pretty common to get leg cramps after having a low blood sugar. The muscles become short of the sugar needed to work efficiently and begin to cramp. After you have regained a normal blood sugar it still takes time for your body to get the glucose to each cell that is why you continued to have the leg cramps. Remember to eat a healthy diet on a regular routine (around the same time each day) and eat a snack prior to exercise to keep your blood sugars from falling.