Avoiding late goals

Concentration? or what? Here's the chart showing when we score and concede during a game.  Its fairly even through the first 85 minutes but w;ve conceded double in the last 5 minutes plus stoppage time than we;ve scored Any particular reasons - fitness? tactics?  naivety?  lack of determination? lapse in concentration? http://stats.football365.co.uk/dom/SCO/teams/Arbroath.html                 Source: Lichties Mad

Source: FOOTYMAD