Try passing the value without serializing it manually, because WordPress will do it for you anyway:
add_user_meta( $user->id, 'orewpst_capabilities', array( 'author' => 1 ), true );
or
update_user_meta( $user->id, 'orewpst_capabilities', array( 'author' => 1 ) ); // it will create the meta data for you if it doesn't exist already.
The s:23 means that you stored a string with 23 chars.
Hope it helps!
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