related products sometimes messed up

-- HikaShop version -- : 2.4.0
-- Joomla version -- : 3.4.1
-- PHP version -- : 5.3.27
-- Browser(s) name and version -- : chrome
-- Error-message(debug-mod must be tuned on) -- : related products sometimes messed up

There is a stange problem that the related products in backend sometimes are messed up
for example,I choose 4 items for one product as "related products",but one or two days later the "related products"list become very long even to 26 products.(in this product page you can only see 4 related products ,that is because I restricted it and don't display the pagination under related products mudule)
Can you help fix it?
Thank you very much.
Jacky

Hi,

See option"Make product association in both ways":
www.hikashop.com/support/support/documen...ig.html#main_product

Regards,

Thank you Jerome,I uncheck this option and see if it works.