My unsolicited advice:
For these kind of questions, when something doesn't seem right, always ask "is what I am seeing really representative of the actual object in question".
In this case, is it likely that the wingtip of the real airframe is actually asymmetrical, given what we know about aircraft and about J-10s and that it makes no sense for J-10s or any other aircraft to have a random wingtip cut off or removed like that?
Or, is it more likely that it is some sort of result of the picture being taken or the image being edited post take?
In this case, it is the latter, and likely a result of the aircraft not fully being in frame for some reason, and they happened to have duplicated and reversed the original image to produce the picture of "two" J-10s in the image, when in reality it was only one airframe, but simply duplicated and rotated.