User blog comment:Billicusp/Extending ExE to absurd heights/@comment-5529393-20160222033533/@comment-27071675-20160222210512

Because it's a matter of single vs. double braces.{#{#{...{#}...}#}#} is equal to { {1} }, and is equal to { {2} }. I'm not using these as hyperoperations, but rather that { {n} } is equal to.