I guess you did something wrong in the import or preprocessing of your dataset, or the selection of the options.
At this moment, I can't help you debugging your results with this little information, because there are too many possible sources of error.
Please start by reproducing the tutorial with the SEEG dataset provided, to confirm that you manage to reproduce exactly the results.
Then start over your analysis, and detect the very first step where you start to observing divergent results between the tutorial and the analysis on your own data.