data question

I use swat as my dataset but i get this question :
Tried to append a tensor with incompatible shape to a list. Op element shape: [114,900] list shape: [153,900]

swat's num_features is 51 ,so 153 equal to 51 *3 but why 114(38 * 3) ? 38 is the  old num_features which i had fix it .