Why do some ai plug-in machines print boards in the opposite direction?

The two positioning holes of the printed circuit board are the same. The printed circuit board in ai plug-in machine needs to go through many processes, such as imposition processing, assembly and testing, and needs accurate positioning. Therefore, it is generally required to design positioning holes. Each printed circuit board should be designed with two positioning holes, one designed as a circle and the other designed as a long slot. The former is used for positioning and the latter is used for guiding. If the two locating holes have the same shape, the system can't locate them accurately, which will cause the boards punched by the ai plug-in machine to have opposite directions.