I have a little problem about my research on steganography. For short, I used StegSpy 2.1 to run a test for my stego images. I used 9 JPG images, 9 BMP images, and 9 PNG images. From all of them, there are 5 stego images that detected has steganography in it. 3 from PNG files, 1 from JPG, and 1 from BMP. The problem is, my mentor asked me about how come the PNG files got the most detected files than JPG and BMP. I don't know how to answer. Can anyone help me about that?