Following on from what Ruud and MarsG76 said, perhaps you could have a look at Jupiter again but compare the image in each half of the binocular? I.e close one eye at a time and then try to focus that barrel. If you can get sharp images, but not at the same focus, then the dioptre is not adjusted correctly. If you can only get a sharp image in one barrel then the other has an issue (loose element?). You should be able to get a sharp image in each barrel but if the two images won't combine you have a collimation error. Easy test for this is to look at a distant object like a telegraph pole in the daytime. Close one eye at a time and see if the image shifts eye to eye. With well collimated binoculars you should be able to move the binos several inches away from your eyes and still hold the object in each field as you alternate between eyes, even if not both perfectly centered. Astronomical objects like stars and planets with extreme contrast in the field are much more demanding on the optics of both the binos and your eyes/brain - especially with regards to collimation - than terrestrial daytime viewing. Good luck in sorting it out.