order export double orders

-- url of the page with the problem -- : www.lindls.com
-- HikaShop version -- : 2.3.0
-- Joomla version -- :2.5


Hi I use the newest Hikashop Version.
1.) When I export my orders I have sometimes a order double.
For example I export 10 different orders and he will print f.ex. 11 orders because one is double. that happens nearly in evrey session
2) When I export the orders and after that click unmark, he will export again, or if I click print bill he will export the orders again. It seems that it would not empty the cache? This problem occurs already in the last version but wasn´t to hard for me

The first problem is serious because it´s hard to find out!