Hi,
The activation link is pointed to the checkout.
Because you open the link with a different browser ; you do not have your cart in the session (because it's another browser).
So you have an empty cart.
When you have an empty cart and you want to display the checkout; you're redirected to the product listing.
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.