Multiple Part question:

Created an Invoice with various cells. There is a Customer Name, Address,
City, State, Zip and Phone Number. I've created a separate worksheet that
contains the Customer information. I created a Drop Down Box on the Invoice.
Created a VLOOKUP for the Address, City, State, Zip and phone number Cells.

=VLOOKUP(D12,CUSTOMER!A2:F6,2,TRUE)

Question 1:

The 1st few records work perfectly.
1. I choose the Customer from the drop down list and the remaining fields
self-complete.
2. There are several records that won't populate. They show on the drop
down but none of the fields populate when you choose the customer.
3. I have verified there is data in the VLOOKUP fields

Any suggestions would be great.

Question 2:
How do I make the Customer Field be empty until I choose the drop down arrow.

Thanks in advance.