No way to change quantity in cart

Hello…For some reason when an item is added to the cart, there is no way to adjust the quantity for that item. I see a greyed out “UPDATE CART” button, but no way to change the quantity. If we go back to the product and try to add another by clicking, we’re told “You cannot add another “Piano Scarf” to your cart.”

https://www.marilynbrooks.com/product/piano-scarf/

Any help would be appreciated!
Thanks

### WordPress Environment ###

Home URL: https://www.marilynbrooks.com
Site URL: https://www.marilynbrooks.com
WC Version: 3.2.1
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WP Version: 4.8.2
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### Server Environment ###

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