shopify expert needed for 2 hours quick tasks

https://givejoyshop.com/
this is the shopify site

password
comingsoon2021
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task 1
https://givejoyshop.com/products/create-your-box-of-4
from here if you add quantity it wont add that quantity to cart
task 2
when ever we add multiple orders of the same product and we hit the delete button all the orders of the same product delete themselves instead of just the order that needs to be deleted