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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Forms , Checkboxes Not Appearing Correctly

Salient Theme Uses the Select2 JS Library to Enable Fancy Select/Checkbox/Radio Styling . If for some reason the Option is conflicting with Third Party Plugins . You can turn it off in Salient Theme Options Panel - > Form Styling Tab

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