Multiple citation numerals lack commas or hyphens

I am editing a manuscript in Microsoft Word for Mac (16.114.3). My style is Journal of Occupational and Environmental Medicine. I inserted two citations after the following sentence: A substantial literature links PTSD to elevated risks of cardiovascular disease. Zotero inserted them correctly according to JOEM style as superscripts 1 and 2, but there is no comma between them, so it looks like the number 12. If I insert a third reference, the superscript then appears as 123. The 12 should really appear as 1,2 while 123 should appear as 1-3. What is wrong?
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