Noobie having trouble with lock sticking at 180º

[Sewer21]

I am new to lock picking and new to lock picking 101. When I bought my picks I also purchased a set of 5 pin and tummbler locks. Lock one has only one pin, lock two has two pins, ect. I have no problem with locks 1,2, and 3 but when I get the fourth and fifth locks to turn they only turn 180º instead of the full turn 360º.

Most of the time I can turn them the 180 back to the starting position but occasionally they get stuck at the 180 and I have trouble getting them back to the starting position.

There is a key that works on all 5 locks, turning them all a 360º

Anyone know what I am doing wrong?
Any help would be appreciated.

[TigerDragon]

Please don't post the same question in multiple locations. See my response to this same question in the other forum category.

[raimundo]

top pins are dropping into your empty end of the keyway, lift em out and turn it. use the straigt edge of a pick or use a tensor and just stroke them back with a halfdiamond.