Copies are not in correct order.
You placed the originals in the incorrect order.
To copy a multi-page original using the ADF, make sure the first page is topmost.
In addition, set [Printing Order] to [From the first to the last].
Copies are blank.
The original is not set correctly.
When using the exposure glass, face the originals down. When using the ADF, face them up. See, Placing Originals.