I've noticed for a while now that when purchasing two of the same weapon for a ship, the second one shows the price as double. After that, it shows the correct price

[09/10/15 18:01:38] 1x of Fast Charge Power Cell purchased for a total price of 3,462c.
[09/10/15 18:01:44] 2706 credits deducted from your account.
[09/10/15 18:01:44] 1x of Neutron Blaster MkII purchased for a total price of 2,706c.
[09/10/15 18:01:45] 2706 credits deducted from your account.
[09/10/15 18:01:45] 1x of Neutron Blaster MkII purchased for a total price of 5,412c.
[09/10/15 18:01:57] 2706 credits deducted from your account.
[09/10/15 18:01:57] 1x of Neutron Blaster MkII purchased for a total price of 2,706c.
[09/10/15 18:01:58] 2706 credits deducted from your account.
[09/10/15 18:01:58] 1x of Neutron Blaster MkII purchased for a total price of 2,706c.

That could happen if you purchase multiple things too quickly.
Basically, the client records your credits before the purchase and after the purchase is complete and shows the difference between the two.

sorry to be a party pooper ray, but i've noticed this like forever. it is a bug. no matter how you explain it away.

A cosmetic bug sure, but still a bug.