I cleared all cache and try on different computer but the result is the same.
I tried your css code but it impact the first columns only. weird!!
After clearing the browser cache and comment my css
.hikashop_products .hikashop_subcontainer.thumbnail { height: auto !important; }
I have a bad result : height of my box is equal to 161px (see image 1)
I reload the same page and bingo the result is right height is equal to 263 (see image 2)
only the first columns have no impact?? and why after reload the page, result is good (however the result is never right with chrome)
I configure my shop with div dimension 1x10
PS : My shop is online so I have to edit back my css with "height: auto !important;"