The title is self explanatory. I problem that keeps coming up in recent weeks is that when adding citations, they often look fine at first, but then when I come across them later, instead of the citations (names and dates of publications) zotero has printed pages of text from the source documents, interspersed with my text so that I then have to delete and often re-write pages of text.

You can imagine this is annoying to say the least. Any idea what's going on and how to stop it?