Empty cart error in Pro

The cart total is not updating according to the fields outlined in the form settings. I’ve followed the instructions on https://vfbpro.com/faq/empty-cart-error/, and everything seems to be fine as far as settings go. I’m not seeing an obvious plugin conflicts, what’s the next step to finding out what’s wrong?

https://ww.wp.xz.cn/plugins/visual-form-builder/