Thanks for the answer!
That box is already ticked in the settings. I’m already using a modified Vancouver style since I have a quote and needed to add the page number to a citation, so I added a field for that in the citation templates, this now called Vancouver Copy. I changed nothing more in the Vancouver settings. When I change to Vancouver, the qoute page disappears and the multiple citation turs into a range. When I go back to Vancouver Copy, the page comes back, but the range turns into seperate numbers even though I haven’t changed that setting. I also tried to untick the box, saved, and ticked it again. Same result.