The GBP65.00A indicates an "additional amount paid" and that only occurs when one ticket was issued and then a change was made and the amount due changed.
My guess would be that you changed one (or both) of the flights and that as well as any change in fare a change fee.
Now in those circumstances I wouldn't expect the boxes to add up (it's one of the black arts of the airline world). On the other hand the amounts really don't make sense. The PD amount should (in my view) be either 27 or 21 and code XT not VQ and DQ as a tax code is a Finnish Security Charge. See:
http://www.iata.org/NR/rdonlyres/ED8.../TAX_Codes.pdf
I'd have a chat with whoever you bought the ticket from!