Getting diarrhea from eating Pancakes is possible but it's not really normal for people to get diarrhea just from eating pancakes.
If you're getting diarrhea from eating pancakes then it could mean you're having an allergic reaction to the pancake batter.
Some people just can't eat certain foods and although it's not likely to be deadly to eat the pancakes when you get diarrhea from them it still is not pleasant to have diarrhea after eating pancakes.
If you get diarrhea after eating pancakes you should tell a doctor about it because it's not normal.
Some people are allergic to the flour used in pancakes and may wheat allergy.