Duplicated steps in + - buttons

[DiegoFdezmk]

Hi, I'm installed the woocommerce quantity increment in my web, with Ronneby Theme.
My first problem was that the arrows of the quantity selector did not appear in the variable products, so I installed this plugin. With this plugin I solved the problem of the arrows of the selector in the variable products, but another problem was created, which is that the arrows were duplicated in the simple products and in the cart, and by clicking on the selector instead of uploading 1 unit , go up 2 steps.
The worst thing is that now if I delete the plugin, the update cart button stops working.
It's possible to delete the predefined plus minus arrows and function?
I'm going crazy.
Can you help me?
Thanks in advance.