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The duplicate numbers are when you duplicate the numbers into more numbers, representing multiple.
This is a jukugo word that uses the on'yomi readings of the kanji. You should be able to read this on your own.
私には複数のニックネームとアカウントがあります。
I have multiple nicknames and accounts.
An update is needed before you can continue but you have more than one WaniKani tab open.
Finish up whatever you are doing on the other tab(s), then close them to continue.
The update will complete automatically once the other tab(s) are closed.