When left alone squids beach themselves on the block next to the water killing themselves

When left alone squids beach themselves on the block next to the water killing themselves

What I expected to happen was...:
The squids would swim normally through the river

What actually happened was...:
All of the squids eventually beached themselves leaving ink sacs everywhere

Steps to Reproduce:
1. Find a river with squids
2. Wait
3. See the squids dying