Just installed, having a few issues :(

1. hover over side cart icon does nothing, set to go from size 1 to 1.5
2. checkout doesn’t work at all, error message is shown but no reason for the error is given. All checkout form fields have correct info in them.
3. if i select non PayPal payment method the checkout button still says ‘Proceed to PayPal’ instead of Place Order
4. if i modify the number of items in the order within the cart it doesn’t update the number of that item shown in the tally on the add to cart button under the product

https://michaelsphotography.au/shop/

thank you for any help you can provide