google:
postgres case-insensitive collation
so much depends on your version & platform.
https://www.postgresql.org/docs/9.5/static/citext.html
actually, the wording on your initial post is a little confusing.
I'm not sure if you were asking or telling in the 1st statement.
i'm not sure if you want case-insensitive search (and don't have it), or if what you are experiencing is case-insensitive search (and can't believe its true).