Graham Alexander scored from the spot kick and Dickson Etuhu snatched the equaliser with two minutes left.
"We gave away two soft goals and we were 2-0 down when we should have been 3-0 up," said Brown.
"Ricardo Fuller could have had a hat trick."
"We seem to have to be in adversity before we give of our best.
"We are a fit side and we always seem to score the last goal.
"I am still looking towards the play-offs, I am looking up if we can cut out the careless mistakes."