The pages listing the accounts you have on Stack Exchange sites don't show the accounts you have in their meta sites; those pages just list the accounts in the main sites.
The only exception is Meta Stack Overflow, which is the meta site for Stack Overflow, but also the meta site for the Stack Exchange network. It is also the only meta site with its own reputation, while other meta sites have a reputation that is linked to the main site reputation. (In other words, on Meta Stack Overflow, you gain reputation for posts you have there, while this doesn't happen in other meta sites.) That is the reason why it gets listed together the other Stack Exchange sites, even if it is a meta site.