Virtual Network Gateway
I believe that route based Virtual Network Gateways are created as GatewaySKU = Basic by the new Azure Portal but billed as GatewaySKU = Standard.
I created a new Virtual Network Gateway through the new Azure Portal and then checked the GatewaySKU via Azure PowerShell. It showed the SKU being Basic but according to the Portal I was being billed the Standard GatewaySKU rate.
I was able to fix the billing by first changing the GatewaySKU via PowerShell to Standard and then immediately back to Basic.
You should not be seeing this behavior. If it happens again, please open a support ticket through the Azure Portal so that we may investigate why this is happening.