Why do I see multiple External Issue Id's when I'm changing the columns on my Issue Navigator View?

[Angie Affolter]

When changing what columns I see on the Issue Navigator page, when I search I see 15 External Issue Id choices.  Why is that?  

[Nic Brough -Adaptavist-]

I am guessing here, but I think your admins have been asked to import data from other systems, and the "refer back to old system" field has not been reused, just created duplicates.

I would ask your admins to have a look at the duplicated fields, with a view to merging them into one!