I have many facts with 2 or more citations. I have one with 5 citations and they all drop down the correct number of citations that I can choose from. This seems to be the only one causing a problem.
I previously deleted both citations and started again and encountered the same problem, however I have now deleted one citation (Pallot's Marriage Index) and the remaining citation appears correctly with its down arrow. However if I go to the spouse and remove the other citation (Family Search) the remaining citation (Pallots) does NOT display correctly and there is no down arrow. So this must be something to do with Pallot's Marriage Index.
I have now ascertained that wherever Pallot's appears as a citation the link is missing so I think I will give tech support a call and see what they have to say.
Many thanks for your thoughts. By the way where do I delete Ancestry site cookies please? I will report back.