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The source of the problem is the fact that you're doing something that FCPX doesn't really like - you are trying to place a short video clip on the Drop Zone.
When you place your footage on a Drop Zone, for some reason Final Cut synchronizes the frame you "pick" with the whole template's starting frame and not the Drop Zone's starting frame.
Because of that, your Drop Zone videos start "playing" when the template starts (and not when the Drop Zone starts), resulting in an offset. If you use a really short clip, it will often "end" even before FCPX gets to display it (in such cases Final Cut will only show its last frame). The same will occur if you use a longer video but "pick" the frame at its very end.
The workaround for Apple's "workflow" is simple: all you need to do, is create a long video out of your short clip. The quickest way to do that is placing your Drop Zone footage in a Compound Clip (select it and press ALT+G), duplicating your video inside several times and placing the newly created Compound Clip on the Drop Zone of your choice - just as we did in the attached short example video.