I don't think that's a mistake at all, I think they probably still go by ASA as a nickname. Considering the number of Asian Student Associations and African Student Associations who also do so, there is nothing the sorority can do about it.
Most of the ASA chapters at SUNYs were former chapters of the Clionian society and they went back to Clio after the ban on nationals at SUNYs. Alpha Sigma Chi is the only one who didn't.
http://www.greekchat.com/gcforums/sh...highlight=clio