Problem with order cart step4 to step 5 and remove products of the cart

Hi.

I have a problem with plugin, it installed ok and works, but i have a problem with order form Verticalsteps of WHMCS beacuse the button "checkout" don't work and see it with other caracthers, and don't pass to the next step (step 5)
And too dont'n work the action "remove" products of the cart for the client.
In this too cases redirect to main menu of WHMCS

I try with another order forms, the first problem in some case solved, but generate orthers problems, the action "remove" don't work in nothing case.

Thanks, sorry for my english