I tried both with no luck, still having the same issues. I've also deleted the sinnerstosaints.com/store directory (where that particular subdomain was rooted) as well as removed it from the domain's hosting service. Still observing the same behaviour.
I do have one other subdomain setup and running in a similar fashion, but it's name and setup has absolutely nothing to do with the store, so I don't think it should be crossing streams or interfering at all (unless I'm ignorant of something there).
Any other recommendations?