Multiple citations in one pair of brackets AFTER adding them

Hi, I use Vancouver style with brackets and when I have multiple citations Zotero puts each citation into one pair of brackets like this: [1][2][3]. I would like to have all three citations in one pair of brackets like this: [1,2,3]. I've read many questions about this problem, but the answer was always to add them together.
In my case, I've added the citations a while ago and rearranged some of them and now they are not "connected" and therefore are shown seperately. Can I somehow connect them? Or do I have to delete some of them and add them again?
Thank you!
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