stupid question but I gotta ask

I try to run my home game by the proper rules of poker. It recently came to light we are doing the blinds wrong when in heads up play. WE had before, always had the dealer put in the BB and the other player the SB. It has been raised that this is backwards, and the dealer should be the SB.
As mentioned, we try to run by the proper rules, like what you would find in a casino. For example the tournrments directors ass rules.
Have we been doing the blinds wrong for standard casino play? Or, is there no stadard for blinds at heads up play.
Thanks in advance