Why are my cookies coming out pancake textured?

ANd what should I do to fix it? I tried adding more flour cuz when i got done the batter seemed to be runny and so after I did that twice i tried adding more baking soda but they are still so soft there bread like. I used the recipe on the back of the nestille tolhouse choc. chip bag and I followed it exactally. The only reason i can think of is that i used country crock margarine, would that create a prob. I pretty sure i have used it before and they came out just fine.