The two bins on the top of this Walmart order fulfillment cart are no longer allowed, per new rules that take effect this week, and employees can opt to push or pull as safety allows. Dominick Reuter/Business Insider Walmart workers are dealing with some push and pull over the carts used to fill online orders. This week, the company partially reversed recent rules over how to load and move carts in stores. The new rules prioritize customer and worker safety over e-commerce order volume. Most jobs involve a bit of push and pull, but few workers experience it so literally as the Walmart store employees who gather the items shoppers order online for pickup. The company has new instructions for when to push the carts used to fill those orders and when to pull them, according to a recent memo obtained by Business Insider. It partially reverses an earlier policy that some workers pushed back against last week.…