Flashforge finder problem

I've recently got a Flashforge finder. It prints the test pieces perfectly, however, when i upload a file to a memory stick and insert it into the printer and start printing the printer head moves off to the far right corner of the bed and starts to print half on the bed half off ? probably an easy fix but i'm new to 3D printing.

I would try to get the models through the slicer software to see that its possitioned right. Its never a good idea to download a model directly to a USB stick and shuff it in to print it. Download the model to your PC and open it with you slicer software, after inspecting it you can send it to the printer.