When you post, your IP is grouped with others upstream by your ISP - there is probably a banned shill in there somewhere
Write the admins on end , here's how:
Go to QRBunker on End, the current thread.
Go to Globals, you'll see this:
How to ask questions about ENDCHAN >>74034
Directs you to an endchan board where you can make a thread where you can ask about the ban, be sure to post the ban notice