I have a roundup installation 0.5.9 and migrated the 
backend from anydbm to sqlite. 

The problem I have is, that when I retire a value of a 
class it dissappears in the admin area and also in the 
database it is shown as retired. But when I go back to 
create new issue or edit issue, the value is still 
selectable.

I tried to export the class and reimport it to get rid of 
this retired problem. After that the items where shown 
twice in the dropdownbox. The table in the database 
was still correct (only the entries I wanted to have and 
the retired entry) .. I retried it one or two times, and 
got more and more double entries in the dropdown 
boxes, without seeing any wrong entries in the 
database).

I only can say that this didn't happen with anydbm. I 
haven't seen this issue in any other bug reports or if this 
has been fixed.