Error: adding new citation edits other citations

Occasionally, when I add a new citation where there is “No active citation,” then Paperpile will change a citation I had made before (maybe a couple sentences before). e.g. If I cite reference A on sentence 3, and then I want to cite references A and B on sentence 5, then Paperpile will automatically change both sentence 3 and 5’s citations to A and B. Can you please fix this? Thanks!