Bots able to register and bypass anti bot

I’m using the JS antibot feature on wp-members, and despite this checkbox being present on the registration form, bots appear to be able to bypass this and still register.

Any thoughts as to why this is ? The checkbox is there after including the form id but it seems to have little effect as bot accounts are being registered on my system.

The page I need help with: [log in to see the link]