Your "issue" while using the TCPDUMP is that it is showing you the content of the header of the package.
If you still want to use TCPDUMP just remove the -A and. Doing this should remove that from the output.
sudo tcpdump 'tcp port 80 and (((ip[2:2] - ((ip[0]&0xf)<<2)) - ((tcp[12]&0xf0)>>2)) != 0)'