problems with outlining add-to-cart button

-- HikaShop version -- : 6.1.1
-- Joomla version -- : 5.3.4
-- PHP version -- : 8.4.x
-- Browser(s) name and version -- : any
-- Error-message(debug-mod must be tuned on) -- : none

Hi,

I have a problem with outlining the button on a specific page (category) in my hikashop store.
See the attachements for the differences on two pages on the same website.

On the page readers the outlining is like it should be,
on the page books the outlining fails to show it correctly.

Hope you can help me here.