Woocommerce Version 3.3.1 - Released 2018-02-06  is not compatible with Salient Theme Version 8.5.3  . 

Kindly do not Update Woocommerce and Downgrade if you have done so until a Salient Theme Update is released .

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Move Third level menu to left instead of right

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

body .sf-menu li li ul {
    left: -16em!important;
}
body .icon-angle-right:before{content:"\f104" !important;}