Hi,
In HikaShop 2.6.0 we added a "height consistency" script for the product and category listings.
In the view "product / listing_div", you will find the line
<div class="hikashop_products" data-consistencyheight=".hikashop_subcontainer">
If you remove the data-consistencyheight parameter, the script won't be process anymore and each product container will have his own size.
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.