PAK vs ENG: Why Pakistan loses even after winning?

Pakistan has won the 5th T20 match played against England in Lahore. With this win, he also took a 3-2 lead in the series. But even after all this, questions are being raised on the performance of the Pakistan team. Especially questions are being raised on Pakistan’s batting. Pakistan’s middle order is failing miserably. The same thing happened in Lahore also.