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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Navigation gains bottom margin on page scroll

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

 
.sf-menu ul {
    top: 50px!important;
}
.small-nav .sf-menu ul {
    top: 45px!important;
}