Hi,
I am sorry but I am not able to reproduce your issue in my local website or in the demo website.
I just created a test shipping method in the demo website and I can activate (or deactivate) the "price per product" without any issue.
Do you have some view override for the HikaMarket views ?
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.