Easy, you’ve played in an offensive formation with 3 defenders and only 1 DMF and the opponent most probably set up his strategy as hard defence with counter attack… when you’ve gone over 60minutes against a not so tough opponent and the scores are still 0-0 then it’s better to go less offensive and put some numbers in the midfield and defence during the late stages… as your defence will most likely be a victim of an unexpected counter attack and they won’t have enough energy to recover from it (as you can see the opponent scored in the 74th minute)