If Oracle SQL Developer is listing multiple network alias (TNS alias) for a DB, check in your "default tnsnames location" for multiple tnsnames* files.
Oracle SQL Developer joins the entries of all files matching tnsnames*
In my case I had two files tnsnames.ora and tnsnames.ora_OLD in the same directory.
(Some of the alias did not work, because they came from tnsnames.ora_OLD)
I hope it helps.
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