The jig could be worn or damaged or it might not be clamped or secured tightly. It is also possible that the tool was not held tightly against it. It depends on the jig.

It is used for making holes in plastic

An awl is a wood working tool.

Jig will guide the tool toward the work piece but donot hold the work piece. Jig will be placed on the work piece. Whereas the fixture holds the work piece and work piece is clamped to the fixture.

Some words that end with "jig" include rejig (to rearrange), swarajig (an Indian term for a contract laborer), and lumberjig (a woodworking tool).