使用Triple DES时加密的数据大小

I intend to use TripleDES in one of my project. I was doing some experiments to be comfortable with it. I understand block size of triple DES is 8 bytes so I assume that if give 8 byte of data, I should get 8 bytes of encrypted data. But what I get is:I intend to use TripleDES in one of my project.