4 Arrows in the product view

Hi,

1. That's because your HikaShop uses the "old" frontend style of HikaShop.
And thus some of its CSS code is not adapted anymore to the new views of HikaShop.
To counteract that, you can add such CSS:
.hikashop_previous_product, .hikashop_next_product {
width: 19px !important;
height: 19px !important;
}
I would recommend to try migrating to the new default CSS of HikaShop (with the frontend CSS file setting of the HikaShop configuration) when you have some time. You'll have to adapt some CSS to match your website I suppose but it will be worth it in the long run.

2. Regarding the price missing, I suppose that it comes from an old view override that you have.
Try switching temporarily to the default template of Joomla.
If you still have the problem with it, then I would recommend to check your settings and mainly the "show prices" setting of the HikaShop configuration.
If you don't have the problem with it, then you would have to rename the files in the folder templates/YOUR_TEMPLATE/com_hikashop/html/product/ one by one in order to identify the one causing the problem.