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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Remove thin bottom border on transparent header

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

body #header-outer[data-transparent-header="true"].transparent {
    border: none !important;
}