Strange ACF detector behaviour

Hello,

I have created a Ground truth table using 32*32 pixels images and bonds for the ROI object.

I am following the same method as "Train a Stop Sign Detector Using an ACF Object Detector "example

When I apply the detector on the same data used for training I get some false positive rates!!!

and if I used a 90 degree rotated version of the training images I get some false negative detections

When I use the detector with test data I get very high false positive rate!!

Is that normal?

How Can I improve the detection rate?

Attached my Ground truth table and the test images

Best Regards

Hossam Alzomor