true positive value > number of sample in a class

I have more than 6000 samples, which are in 57 different classes. I calculate TP, FP, FN, TN. I also have a number of samples in each class. For some classes I get a higher number of TP than number of sample in that particular class. How is that possible? What does that mean?

[Chandani Madnani]

How are you calculating these values of TP,FP,TN and FN? Using MATLAB ?

[Jasmina Burek]

Sorry about late response. I didn't notice your reply. I found what was the error in my input data - they were not in proper order. Now it's all good. Yes I was using Matlab to calculate those values