Bizarre, it doesn’t show in any browser for us for that particular page.
On this page (http://bustedbling.cmykdevelopment.com/product/long-leg-cast-brace-covers-youth/) it has the arrows disabled on hover.
On this page (http://bustedbling.cmykdevelopment.com/product/short-leg-cast-brace-covers-youth/) which is a duplicate but with different content, it shows the arrows on hover.