Hi Sheesh,
We are having the same problem with customers not being able to remove items from their cart. I found cart.liquid under themes but our code is different. I am very computer illiterate. If you have time, could you look at ours and see what we need to do to fix this issue? The website is www.seedsnsuch.com.
We are using the empire theme if that matters.
Thank you,
Allison