Hello,
I wonder you haven't switch off the pagination, to check this go to Main HikaShop Configuration => Display tab and have a look in GENERAL DISPLAY OPTIONS part to check pagination.
Other point to check is your Item Menu configuration, more especially this point in Items part :
This will define how many product is displayed per page.
Always, in your
Item Menu config and in
Products options tab,
Item Layout part, maybe you have to activate the
Height consistency option.
I notice by the way, that you have some display issue, maybe link to your template ? For this you can try to switch for a default template (like Protostar), to see if that resolve this :
Awaiting news from you to move forward.
Regards