Well, the PT140 is not know for its accuracy, and has a really poor trigger for target shooting. It was designed as a low cost, safe (long and stiff DAO trigger), small and light, high capacity, close range self defense handgun, primarily for concealed carry.
It excels at what it was designed for. It sucks as a target pistol.
Let others shoot it, and try shooting it from a rest, to see if the sights are off. Because of the long trigger pull, I've seen some shooters dip the barrel before the trigger brakes. I personally think these guns require some extra concentration and practice to get accurate hits because of the long trigger pull.