2:32 PM, Monday May 24th 2021
So this is an issue that's quite present throughout the second page especially, but if you take a look at this specific crop, you'll see how your shadows stick to the silhouette of the forms that are casting them, basically behaving just like line weight.
What you said yourself - that the sausage above would cast a shadow on the sausage below - is correct, but that isn't reflected in how you're drawing those cast shadows. You need to be willing to allow the cast shadows to fall a greater distance when necessary, as shown here.