Hi,
I don't understand your numbers and it will be difficult to understand the source of the problem.
What I can tell you is that you should remove the option in the paypal plugin which send the order details to paypal.
This feature could not be right if you have special other features. Because the plugin can't know how sent it to paypal for his process.
Regards,
Jerome - Obsidev.com
HikaMarket & HikaSerial developer / HikaShop core dev team.
Also helping the HikaShop support team when having some time or couldn't sleep.
By the way, do not send me private message, use the "contact us" form instead.