virtually all creatine products carry a risk of stomach upset and "the runs." What were your dosages? If you were loading, try not loading, just take 5-6g a day for a month; you'll be fully saturated. Some people just cannot endure a loading phase.
Even if you were'nt loading, if your dose was higher than say, 10g a day, cut back. Keep it to 5-6g, I even go as low as 3g a day for maintenance.