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The ghost image could be created by the speed of the object, the extra light from the sun reflecting on any internal metal parts of the binoculars which can be coated to reduce glare reflection.
A strong magnification, such as 10x, can be affected by handshake and could possibly create ghost images or optic flare.
Always check focus and adjust the center wheel first. Make allowance for distance, speed and light. A good cleaning may also be in order.