There's not much you can do about it before the weekend, so take them with you to the star party. Chances are very good that someone else there will have the same or similar binoculars and you can compare. Chances are even better that someone there who is more experienced with binoculars can check them out for you.
Someone who is more experienced can also give you observing tips (if you need them).
Worst case: you'll have to send them back to Amazon after the weekend and exchange for another pair. Best case: You'll find someone at the star party who can show you what's wrong and it's something minor (like user adjustment). In the meantime, use them for the weekend even if you have to close one eye at times.
The swing adjustment that moves the two eyepieces closer or farther apart is called the interpupillary adjustment. That should be adjusted so that the centers of the eyepieces are the same distance apart as your eyes. If you wear eyeglasses (not mass-market sunglasses or reading glasses) you can start by matching the distance between the eyepieces to the distance between the centers of the lenses of your eyeglasses. Then look through the binoculars at the stars and fine-tune that distance if needed.
The right eyepiece adjusts it focus independently of the left. First aim at the stars and move the center focus adjustment (moves both eyepieces at once) until the view through your left eye is focused. Then close your left eye and focus the right eyepiece with the ring around it. Then fine tune the center focus adjustment for best focus.
If you still have double vision, try tilting the binoculars left/right very slightly. You may find you need to tilt them to a certain position to minimize the double vision thing.
If between fine-tuning the interpupillary adjustment and fine-focusing and tilting the binoculars right or left you still can't eliminate the double vision, then something is wrong.
I mentioned in another post recently that the Starmasters I have a nice, but they come with a useless case and are not packed well for shipment. That causes many of them to be knocked out of alignment during transport. I bought a plastic foam-lined pistol case at a sporting goods store to better protect mine after I sent them back for alignment.
The universe is not only stranger than we imagine, it's stranger than we CAN imagine. --- JBS Haldane
Come visit me at Comanche Springs Astronomy Campus (we're on Google Maps) in Texas.