Hey there
Sometimes it can be whats called radial pull, if there non-directional you can easily swap left to right or abit longer to do all 4 front to rear. Most Wheel aligner are too fat n lazy to enter your details let alone do the w/alignment properly (most do a toe and go but also figures can be fudged with paper behind the w/align heads). The wheel alignment angle that mainly makes it pull is called castor and it usually takes an accident or gutter hit. Try to put your car on level ground stick 2 fingers behind and in front of both front wheels (It's a quick castor check) If it turns out castor out e-bay have adjustable arms that let you adjust.
Also massive camber difference between wheels can make it pull, but most wrexies have camber pins