I'm not exactly sure where to look on paypal... but I am thinking you need to do some research on paypal site.
first question tho: Is this $2 extra showing up on the VERY FIRST paypal screen? If so, likely this charge is being passed from VM, and therefore its a VM issue.
If it's appearing after the first page, then likely its a charge you have set in your paypal settings on paypal site.
If it is a VM issue, and you only sell downloadable goods, you could always remove, or set permanent the shipping charges in the Paypal config on VM site. Find these settings in VM admin -> List Payment Methods - > Paypal -> Config... see the config something like
"shipping" => sprintf("%.2f", $db->f("order_shipping")),
to
"shipping" => 0,
Likewise you might want to look into what
"no_shipping" => "1",
does with paypal. You can find these variables mean n paypal.