Pix4D not respecting the pointcloud classification to create the DTM

I'm having some problems with the DTM creation. 

After ajust the automatic pointcloud classification process you can see I left not even one point of threes or buildings on my point cloud: 


Even so, the DTM proccess still having some unexpected elevation that complete disregards that classification: 

How can I (or anyone) trust the classification or the DTM result if the program it's not taking on account those specification? 

 

How can I prevent this from happening and have every point on his correct classification? (I don't want to classified all the objects on the "Disable" category. 

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