This is completely normal. It is the result of Zorua's ability [Illusion]
Illusion will cause Zorua to look like the last member of your party, right down to the call, sprite and name, but it will have the moves, typing and stats it normally would.
There are a lot of fun ways to trick your opponent with Zorua this way.
Basically, don't worry, this is exactly what Zorua is meant to do. Have fun and hope this helps.