Hi,
The "add to wishlist" is a know bug of HikaShop 2.2.2 that we are currently fixing.
I published a new package today with several "hot fixes" include some improvements for this "add to wishlist" button. It looks like there still is one little problem and I am sure that Xavier will fix it tomorrow.
At this moment I will upload a new package and if all is already, I guess we would be ready for the auto-update.
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.