Salient 8.5.4 is Now Compatible with Woocommerce 3.3.1 . Kindly update the Theme if you have updated Woocommerce . 

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Remove WooCommerce Add to Cart - Amount Function

To remove this:http://ticksy_attachments.s3.amazonaws.com/8206310... .

Add this into the Custom CSS box located in your Salient Options panel:

 
.quantity input[type=number] {
    -moz-appearance: textfield;
     margin: 0; 
}

Cheers :)