Say I typed the code below, just to look at the content of a table (don't slam me for the SELECT *, this is pseudo code).

SELECT * FROM dbo.Address AS A

dbo.Address was automatically aliased as "A", which is fine.

Now, let me double-click on "Address" and replace this table name with another one, just because I want to save time:

SELECT * FROM dbo.Affiliation AS A AS A

This time, the table was automatically aliased again, but your feature does not seem to care if the table was already aliases.

So now, the table is double aliased.